a transient ischemic attack often precedes which type of stroke?a. ischemic strokeb. intracerebral hemorrhage c. subarachnoid hemorrhaged. subdural hematoma
Answers
A transient ischemic attack (TIA) commonly precedes an ischemic stroke. TIAs, also known as "mini-strokes," occur when there is a temporary disruption of blood flow to the brain.
A transient ischemic attack (TIA) is characterized by a temporary interruption of blood flow to a part of the brain, resulting in stroke-like symptoms that typically last for a few minutes to an hour. These symptoms may include sudden weakness or numbness on one side of the body, difficulty speaking or understanding speech, vision changes, dizziness, and imbalance. However, unlike an ischemic stroke, a TIA does not cause permanent brain damage or leave lasting neurological deficits.
The reason why a TIA often precedes an ischemic stroke is that both conditions share common risk factors and underlying mechanisms. TIAs are often caused by a temporary blockage of blood flow to the brain, usually due to a blood clot or plaque buildup in the arteries supplying the brain. These blockages can be transient and resolved on their own, but they serve as a warning sign that there is an underlying issue with the blood vessels.
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Related Questions
specialized structures that recognize neurotransmitter molecules and, when activated, cause a change in the electrical activity of the neuron, are called
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Specialized structures that recognize neurotransmitter molecules and, when activated, cause a change in the electrical activity of the neuron, are called receptors. Receptors are proteins embedded in the cell membrane of neurons, with some of them located on the cell body or dendrites. When neurotransmitters bind to receptors, they initiate a cascade of events which ultimately cause a change in the electrical activity of the neuron.
Receptors can be classified into three categories: ionotropic receptors, metabotropic receptors, and G protein-coupled receptors. This flow of ions causes a rapid change in the electrical activity of the neuron. G protein-coupled receptors are also located in the cell membrane and are activated when a neurotransmitter binds to them, triggering a series of events which ultimately cause a change in the electrical activity of the neuron.
In summary, specialized structures which recognize neurotransmitters and, when activated, cause a change in the electrical activity of the neuron, are called receptors. These receptors can be classified into three categories: ionotropic receptors, metabotropic receptors, and G protein-coupled receptors. All of these receptors serve the same purpose, which is to regulate the electrical activity of the neuron.
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1. What is the difference between weathering and erosion?
2. How are mechanical weathering and chemical weathering different?
3. How are hydrolysis and oxidation similar?
4. Explain the process of exfoliation
5. As waves crash into rock along the shoreline, particles of sand, shell, and other materials in the
ocean water loosen tiny bits of sediment from the rock. As the waves recede, they carry the
sediment away. In this scenario, which process represents weathering, and which process
represents erosion?
Answers
Answer:
(1).When the smaller rock pieces are moved by these natural forces, it is called erosion. So, if a rock is changed or broken but stays where it is, it is called weathering. If the pieces of weathered rock are moved away, it is called erosion.
(2).Mechanical weathering breaks rocks into smaller pieces without changing their composition. ... Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface. Water, carbon dioxide, and oxygen are important agents of chemical weathering.
(3)Hydrolysis and oxidation are similar in that both involve chemical reactions between a mineral and another material. Hydrolysis is a chemical reaction between a mineral and water. Oxidation is a chemical reaction between a mineral and oxygen. Exfoliation is the cracking of rock caused by a decrease in pressure.
(4)Exfoliation is a process in which large flat or curved sheets of rock fracture and are detached from the outcrop due to pressure release: As erosion removes the overburden from a rock that formed at high pressure deep in the Earth´s crust, it allows the rock to expand, thus resulting in cracks and fractures along sheet ...
(5) The waves crashing into rock along the shorelines , particles of sand,shell. and other materials is the processs of of Erosion . THe last one where waves recede is Weathering .
Answer:
1.Weathering is the breakdown of rock into smaller particles through mechanical or chemical means. Erosion is the process by which weathering products are carried away.
2.Mechanical weathering simply breaks rock into smaller fragments. Chemical weathering actually changes the mineral composition of rock.
3.Hydrolysis and oxidation are similar in that both involve chemical reactions between a mineral and another material. Hydrolysis is a chemical reaction between a mineral and water. Oxidation is a chemical reaction between a mineral and oxygen.
4.Exfoliation is the cracking of rock caused by a decrease in pressure. It occurs when a mass of rock is exposed by weathering and removal of the overlying rock, which decreases pressure on the rock. As a result, the rock expands, which causes the rock to crack.
5.In the scenario, weathering occurs when tiny bits of sand and shell in the waves loosen bits of sediment from the rock. Erosion occurs when the waves carry away those bits of sediment.
Explanation:
Where does frontal inversion occur in the atmosphere and how does it affect us and the environment? Wanther High
Answers
Frontal inversion occurs near large water bodies and it leads to a change or invertion in the property of the atmosphere.
What is frontal inversion?Fontal inversion occurs through the impairment of cold air mass in warm air mass.
This leads to a warm air just above the two air masses as cold air distrupt the warm air masses.
Therefore, the frontal inversion takes place near water bodies and it leads to a change or invertion in the property of the atmosphere.
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Carbon dioxide and ________ are the most important heat absorbing gases in the lower atmosphere.
Answers
Answer:
Methane
Explanation:
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Match the following type of vessel with its structure: Venules.
• Smaller vessels that distribute blood to specific body organs
• Smallest vessels leading away from capillaries
• Thick-walled, large vessels near the heart that conduct blood continuously away from the heart
Answers
The correct option is smallest vessels leading away from capillaries. Venules are the smallest vessels leading away from capillaries. Structure of Venules.
Venules are small vessels that connect the capillaries to veins. They are the smallest of the veins and are formed when the capillaries join together. Venules range in diameter from 8 to 100 μm, and their structure is similar to that of the capillaries.
Venules are the sites of both the delivery and exchange of blood-borne substances. Blood flows from the capillaries to the venules, and the blood pressure in the veins is significantly lower than in the arteries.
Therefore, the correct option is smallest vessels leading away from capillaries.
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In pea plants, tall stems are dominant to short stems, and purple flower color is dominant to white flower color.
a. If a homozygous tall, white plant is crossed with a homozygous short, purple plant, what will be the phenotype of the F1 generation?
b. If an F1 plant from this cross is then crossed with to a homozygous tall white plant, what will be the possible phenotypes of the offspring, and in what expected proportions?
Answers
a. If a homozygous tall, white plant is crossed with a homozygous short, purple plant, the phenotype of the F1 generation will be heterozygous tall, purple plants. b. If an F1 plant from this cross is then crossed with to a homozygous tall white plant, the possible phenotypes of the offspring will be heterozygous tall, purple plants and heterozygous tall, white plants in 1:2 expected proportions.
a. Homozygous tall, white plant is crossed with a homozygous short, purple plant, the phenotype of the F1 generation will be heterozygous tall, purple. A Punnett square can be used to determine the F1 offspring. The genotype of the homozygous tall, white parent would be TTWW and the genotype of the homozygous short, purple parent would be ttww.
Therefore, the F1 offspring will be heterozygous tall, purple plants (TtWw).
b. If an F1 plant from this cross is then crossed with a homozygous tall white plant, the possible phenotypes of the offspring would be heterozygous tall, purple plants and heterozygous tall, white plants. The expected proportions of the offspring are:
1/4 of the offspring would be homozygous tall, white (TTWW).
1/4 of the offspring would be homozygous short, purple (ttww).
1/2 of the offspring would be heterozygous for both traits (TtWw).
A Punnett square can be used to determine the offspring of the cross.
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Part I Illuminating Photosynthesis #1 : Fill in this concept map depicting the major steps in photosynthesis in the chloroplast H20 of Photosystem I transfers Word Bank Electron Transport Chain ATP Synthase Calvin Cycle Light NADPH Chlorophyll Protons CO2 Photosystem II Electrons 02 to produce ATP G3P (Sugar Building Block) #2 : Fill in the table: Major Steps in Does this step depend on Experimental variable to What would happen if an Photosynthesis any other step? How? measure? herbicide disrupted this Photosystem II Photosystem l ATP Synthase Calvin Cycle
Answers
Photosynthesis in chloroplasts involves major steps such as light absorption, electron transport, ATP synthesis, and carbon fixation. It begins with light-dependent reactions in photosystems I and II, followed by electron transport and ATP synthesis.
Step 1: Photosynthesis is a complex process that occurs in the chloroplasts of plants, involving several major steps such as light absorption, electron transport, ATP synthesis, and carbon fixation.
Step 2:Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. It occurs in the chloroplasts, specifically in three main stages: light-dependent reactions, electron transport chain, and the Calvin cycle.
During the light-dependent reactions, light energy is absorbed by chlorophyll molecules in photosystem II (PSII) and photosystem I (PSI). In PSII, water molecules are split, releasing electrons, protons (H+ ions), and oxygen. The electrons move through an electron transport chain, creating a proton gradient across the thylakoid membrane. This gradient is essential for ATP synthesis by ATP synthase, using the energy from the electron flow.
In PSI, electrons are re-energized by absorbing more light energy and are ultimately used to produce NADPH, another energy carrier. The ATP and NADPH generated in the light-dependent reactions are then used in the Calvin cycle.
The Calvin cycle, also known as the light-independent reactions or carbon fixation, occurs in the stroma of the chloroplast. It uses ATP, NADPH, and carbon dioxide (CO2) to produce glucose (G3P), which serves as a building block for sugars and other organic compounds. The cycle regenerates the starting molecule, ribulose bisphosphate (RuBP), allowing the process to continue.
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2Mg + O2 ----> 2MgO
in the equation above , how many atoms are in the oxygen molecule
A.2
B.0
C.1
D.3
Answers
Answer:
2
Explanation:
Which term describes the relationship in which one organism lives inside the other one. Check ih correct answer
Answers
Answer:
The term that describes the relationship in which one organism lives inside the other one is endosymbiosis.
Explanation:
Question 7
Marks: 1
The recommended backfill over the absorption field is 8 to12 inches.
Choose one answer.
a. True
b. False
Answers
The recommended backfill over the absorption field is 8 to 12 inches. Your answer: a. True which is to ensure even distribution of wastewater and its treatment by soil through pipe network.
8 to 12 inches of backfill is advised over the absorption field. Although the particular criteria may change depending on local standards and regulations as well as the septic system's construction, this statement is typically accurate.
A vital part of a septic system is the absorption field, commonly referred to as the drain field or leach field. The wastewater from the septic tank can be distributed and treated by the soil through a network of buried perforated pipes or chambers.
Gravel or sand can be utilised as the backfill material to cover the absorption field because they are porous and well-draining. The backfill layer should be thick enough to cover and support the pipes or chambers adequately, while also allowing for optimum oxygenation and effluent drainage.
Generally speaking, most home septic systems require a backfill depth of 8 to 12 inches. However, depending on elements like soil type, climate, and system design, the precise requirements could change. To make sure that the backfill depth complies with the necessary standards for a safe and functional septic system, it is crucial to consult local ordinances and regulations as well as a licenced septic system professional.
Hence answer is true.
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where are t and b lymphocytes located in lymph nodes, and how is their anatomic separation maintained?
Answers
Lymphocytes are divided into two main types, namely B lymphocytes and T lymphocytes. B lymphocytes make antibodies, and T lymphocytes help kill tumor cells and help control the immune response.
Both originate from stem cells in the bone marrow and initially have a similar appearance.
LymphocytesLymphocytes are a type of immune cell made in the bone marrow and found in blood and lymph tissue. B cells are so named because they develop in the Bursa of Fabricus (in birds) or in the bone marrow (in humans). While T cells are so named because they develop in the thymus.
Some lymphocytes migrate to the thymus, where they mature into T cells and others remain in the bone marrow, where they eventually develop into B cells.
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Describe how an action potential arriving at a presynaptic membrane of a neurone can result
In the depolarisation of the membrane of a post-synaptic neurone.
Answers
2. Nat, moves sideways / attracted to areas at resting potential,A local circuit
3. causes, Na+ ion channels to open / 2nd depolarisation
4. (transmission) in one direction due to, hyperpolarisation / refractory period
5. myelin sheath / Schwann cell
sheath insulates, axon / dendron / neurone
6. depolarisation / action potential, only at nodes of Ranvier / unmyelinated part ora
7. saltatory conduction / action potential
'umps' from node to node
What is true of the elevation of every point along any given contour line?
Answers
Answer:
Every point on a contour line is of the exact same elevation
Explanation:
Every point on a contour line is of the exact same elevation. In other words, contour lines connect points of equal elevation. By definition, contour lines separate points of higher elevation from points of lower elevation.
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Using the diagram, which of the structures is the oldest?
H
F
M
B
Answers
Answer:
Im saying that its B or H
Explanation:
What sequence of bases on RNA would match, or pair with, the following DNA sequence: GCA?
Answers
The sequence of bases on RNA that would match or pair with the following DNA sequence: GCA is CGU.
What is transcription?Transcription is the process by which mRNA sequence is produced from a DNA template in the nucleus of a cell.
During transcription process, the following applies:
Adenine (A) pairs with Uracil (U)Guanine (G) pairs with Cytosine (C)This means that the mRNA sequence that will result from a template of DNA with sequence: GCA is CGU.
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The life-cycle of plants has slight variations that characterize major lineages of land plants. what is this life-cycle called?
Answers
The life cycle of plants is referred to as the alternation of generations. This is a characteristic feature of land plants, which have evolved from their ancestral aquatic ancestors.
The alternation of generations is a cycle of two distinct stages in the life of a plant: the gametophyte stage and the sporophyte stage.
In the gametophyte stage, the plant produces gametes, which are reproductive cells that are involved in sexual reproduction. During this stage, the plant produces either male gametes or female gametes, which then fuse together to form a zygote, which is the first cell of the sporophyte stage.
The sporophyte stage is characterized by the production of spores called spores, which are produced by meiosis, a process of cell division that reduces the chromosome number by half. The spores are then dispersed, and each one can develop into a new gametophyte plant, thereby completing the cycle of alternation of generations.
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The cubic shape of a mineral crystal is most likely
the result of that crystal's
(1) hardness
(2) density distribution
(3) internal arrangement of atoms
(4) intensity of radioactive decay
Answers
Which of the following statement is false about protist and fungi?
A. Protist may have cell walls and fungi have cell walls made of chitin.
B. Both are eukaryotes.
C. Both are multicellular, however, most fungi are unicellular.
D. All of the above are correct.
Answers
The false statement about protist and Fungi is : ( D ) All of the above are correct
Protist and FungiProtist and Fungi are similar in certain ways and are usually multicellular organisms but predominantly they are unicellular in nature.
Protist and Fungi do not move but are Eukaryotes due to the presence of a nucleus and membrane bound organelles which are absent in prokaryotes. protist have cell walls which help protect the cell just like Fungi also has its cell wall made up of Chitin and other substances.
Hence we can conclude that the false statement about protist and Fungi is that all of the above statements are correct.
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Which cell contains membrane bound organelles in addition to a cell wall and chloroplast
Answers
Answer:
Eukaryotic cells
Answer:
plant cells and eukaryotic algae
Explanation:
Only plant cells and some algae have chloroplasts.
Select the three key concepts from the following research question:
What are the effects of cannabis on brain development in teenagers? Question 3 options:
a. Effects
b. Cannabis
c. brain development
d. teenagers
Answers
The three key concepts in the research question that are the effects of cannabis on brain development in teenagers are: effects, cannabis, and brain development, the correct options are a, b, and c.
The main concept of the question is "cannabis," which refers to a psychoactive drug that is widely used by teenagers. The second concept is "brain development," which refers to the biological and neurological changes that occur in the brain during adolescence.
The third concept is "effects," which refers to the potential impact that cannabis use may have on brain development in teenagers, the correct options are a, b, and c. In brief, this research question seeks to understand how cannabis affects the developing brains of teenagers.
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true or false? accessory structures are called "epidermal structures" because even though they reside in the dermis, they are made of, and by, epidermal cells.
Answers
Answer:
true
Explanation:
because: accessory structures are called "epidermal structures" because even though they reside in the dermis, they are made of, and by, epidermal cells.
Why was motion of Earth not observable after the action-reaction event with the ping pong ball or clay ball?
Answers
According to Newton’s third law, motion of Earth is not observable because Earth is so large, we cannot perceive the change as it is so negligible.
Newton's third law of motion states that every action has a corresponding and opposing response.
The action-reaction forces can be used to study or observe Newton's third law. When a clay ball or ping pong ball is put to the ground, the clay ball flattens on the side that meets the ground while the ping pong ball rebounds into the air.
Newton's third law states that even though the action-reaction forces on the balls and the Earth were equal in strength and directed in opposing directions during each encounter, the resulting movements of the interacting objects were dependent on their masses.
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which of the following is not a diffrence between DNA and RNA
Answers
Answer:
DNA is stable under alkaline conditions, while RNA is not stable. DNA and RNA perform different functions in humans. DNA is responsible for storing and transferring genetic information, while RNA directly codes for amino acids and acts as a messenger between DNA and ribosomes to make proteins.
Explanation:
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Which main type of sedimentary rock forms from dead plant and animal material?
Answers
Answer:
limestone, chert, dolostone, gypsum, halite (rock salt), diatomite, and chalk.
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Explanation:
Answer:
Letter C: Organic
Explanation:
Took the test and got it right :) Hope this helps!
In the equation 6x – 2 = –4x + 2, Spencer claims that the first step is to add 4x to both sides. Jeremiah claims that the first step is to subtract 6x from both sides. Who is correct? Explain
Answers
In the equation 6x - 2 = -4x + 2, Jeremiah is correct in his claim that the first step is to subtract 6x from both sides.
Solving algebraic equationsTo solve the equation, the goal is to isolate the variable 'x' on one side of the equation. To do this, we need to eliminate the x-terms on one side.
If Spencer were to add 4x to both sides, the equation would become:
6x - 2 + 4x = -4x + 2 + 4x
Combining like terms, we would have:
10x - 2 = 2
However, subtracting 6x from both sides, as Jeremiah suggests, would give us:
6x - 6x - 2 = -4x - 6x + 2
To simplify, we have:
-2 = -10x + 2
Now, we can proceed with solving the equation by manipulating and simplifying further. But in terms of the first step, Jeremiah's approach of subtracting 6x from both sides is the correct choice to eliminate the x-terms on one side of the equation.
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what is the mid line of myosin fibers called in a sarcomere?
Answers
The midline of myosin fibers in a sarcomere is called the M-line. The M-line is a dark line that runs vertically through the center of the sarcomere and is formed by proteins that hold the myosin filaments in place.
The M-line provides structural support for the sarcomere and helps to maintain the alignment of the myosin filaments during muscle contraction. The M-line also serves as an attachment site for other proteins, such as titin, which plays a role in maintaining the elasticity of the muscle.
The M-line is a critical component of the sarcomere and is essential for the proper functioning of skeletal muscle.
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What are the names of the TWO equations used to calculate membrane potentials? Other than the number of ion species, briefly describe how they are similar to and different from each other. (4 pts) What is an abnormally high concentration of K* in blood called? Briefly explain how it affects neuronal excitability. (4 pts)
Answers
The two equations used to calculate membrane potentials are the Nernst equation and the Goldman equation.
These two equations are similar in that they both involve the use of ion concentrations to calculate the membrane potential. However, the Goldman equation takes into account the relative permeability of each ion species, while the Nernst equation assumes a single ion permeability.
An abnormally high concentration of K+ in the blood is called hyperkalemia.
Hyperkalemia can cause an increase in the resting membrane potential, making it more difficult for neurons to reach the threshold for an action potential. This can lead to muscle weakness, cardiac arrhythmias, and other symptoms.
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Given that breaking bonds requires energy and forming bonds releases energy, explain how we know that cellular respiration releases energy overall?
Answers
Cellular respiration releases energy because the bonds in carbohydrates are broken during the reaction.
During cellular respiration, carbohydrates are broken down in a series of reactions, and the energy in the bonds is released as ATP, the energy currency of cells.
The reaction is in 3 steps:
GlycolysisKreb's cycleElectron transport chainThe summary of the reactions is represented by the equation below:
\(C_6H_1_2O_6 + 6O_2 ---> 6CO_2 + 6H_2O + ATP\)
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Cell process and transport toturial
Answers
mastering during a contraction, what part of the sarcomere does not shorten? i band. a band. h zone. the entire sarcomere.
Answers
During a contraction, the A band shortens, while the I band and the H zone lengthen.The sarcomere is the basic unit of contraction in a muscle.
It is made up of actin and myosin filaments, as well as several other proteins that aid in the contraction process. During a contraction, the sarcomere shortens, causing the muscle to contract. However, not all parts of the sarcomere shorten equally. In the sarcomere, the I band is the lightest-colored band and consists of only actin filaments. The H zone is the area in the center of the sarcomere that consists of only myosin filaments. Finally, the A band is the darkest-colored band in the sarcomere and consists of both actin and myosin filaments.
During a contraction, the A band shortens, while the I band and the H zone lengthen. Therefore, the correct answer to this question is that the I band does not shorten during a contraction.During a contraction, the A band shortens, while the I band and the H zone lengthen. Therefore, the correct answer to this question is that the I band does not shorten during a contraction.
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