Homework Answers
The order of events can be given as:
- Voltage gated sodium channel open
- Sodium rush into cell
- The inside of the cells become temporarily positive
- Voltage gated potassium channel open which causes potassium flood out of cell
- The inside of the cell becomes more negative than original resting potential
- Voltage gated potassium channel close
- Sodium potassium pumps and potassium leak channels re-establish resting potential
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Order the following events that occur in a neuron in response
to a stimulus
Sodium Potassium...
What is the main function of the sodium potassium pump in the neuron? a. Establish concentration...
What is the main function of the sodium potassium pump in the neuron? a. Establish concentration gradients for sodium and potassium ions. b. Depolarize the membrane to threshold. c. Make the inside of the cell more negative than the outside. d. Make the inside of the cell more positive than the outside. e. Pump ions down their concentration gradients during an action potential. A patient of yours has been poisoned by a toxin which prevents fast repolarization of the membrane...
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of...
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of the cell. Then sodium channels close and potassium (K+) rushes out of the cell, causing of the cell. However, the potassium overshoots and causes Question 5 2 pts During the refractory period, the pumps Na+ ions out of the cell and K+ions into the cell, re-establishing the resting membrane potential and concentration gradient. Serotonin Acetylcholine Glutamate Endorphins Barbiturates GABA Dopamine Cocaine Sodium Potassium Calcium...
An action potential does not move back wards in the axon because.. a.Voltage-gated sodium channels behind...
An action potential does not move back wards in the axon because.. a.Voltage-gated sodium channels behind the action potential are inactivated. b. Potassium leak channels no longer let potassium ions through c. Voltage-gated sodium channels are open d. Mechanically-gated channels prevent outflow of sodium e. Voltage-gated potassium channels are closed
In its resting state, the membrane surrounding a neuron is permeable to potassium ions but only...
In its resting state, the membrane surrounding a neuron is
permeable to potassium ions but only slightly permeable to sodium
ions. Thus, positive K ions can flow through the membrane in an
attempt to equalize K concentration, but Na ions cannot as quickly.
This leads to an excess of Na ions outside of the cell. If the
space outside the cell is defined as zero electric potential, then
the electric potential of the interior of the cell is negative.
This...
Match each event with the action that follows it. Drag each item on the left to...
Match each event with the action that follows it. Drag each item on the left to its matching item on the right. The cell returns to resting potential. Sodium and potassium gates close. Neuron receives inhibitory chemicals. The cell depolarizes. The cell hyperpolarizes. Sodium gates open.* Potassium gates open.** Neuron receives excitatory chemicals. * Sodium ions rush into the cell. Potassium ions rush out of the cell.
With respect to the membrane potential which of the following is NOT true? A. In resting...
With respect to the membrane potential which of the following is NOT true? A. In resting cells, the membrane potential is negative because sodium ions are less permeable than potassium ions. B. The resting potential of the nerve cell depends on voltage gated potassium channels C. While chloride is much more permeable than sodium, it adds relatively little to the negative membrane potential. D. The concentration of chloride inside/outside the cell is the reciprocal of the potassium concentration of the...
This time you get into a snail brain neuron that is completely quiet. The cell doesn't...
This time you get into a snail brain neuron that is
completely quiet. The cell doesn't even begin to fire action
potentials when you inject depolarizing current, so you question
yourself if you are actually in a neuron. Nevertheless, you briefly
hyperpolarize thecell, and right after the hyperpolarization stops,
the cell fires a few action potentials that have a quite large
amplitude and then the cell becomes quite again. What could be
going on here? Your traces kind of look...
Use what you know about the physiology of neurons to answer the following questions. Treat each of these questions as u...
Use what you know about the physiology of neurons to answer the following questions. Treat each of these questions as unrelated to each other. a. Imagine that a mutation makes Na* leak channels just as common as K' leak channels. Explain the effect of this mutation on the resting potential of this neuron. 3. b. The intracellular:extracellular ratio of K' ions is normally 150:4mM. Imagine that you decrease that ratio to 150: 20mM. Describe the subsequent effect on the resting...
Hello, I need help in a MCQ question. Thank you. Which one of these processes causes...
Hello, I need help in a MCQ question. Thank you. Which one of these processes causes the neuron to return to the "resting potential" from the state of "action potential"? 1) Ion channels allow positively charged ions to flow out of the neuron. 2) Sodium-potassium pumps remove positively charged ions from the inside of the neurons until the "polarized state" is restored. 3) Enzymes dissolve the positively charged ions in the cells. 4) Negatively charged ions flow into the neuron...
lg0i0oyy.chUmycvitemiew assignmentProblemID-105296236 < Homework #8 How Neurons Work (1 of 3): Neuron Structure and Resting Potential...
lg0i0oyy.chUmycvitemiew assignmentProblemID-105296236 < Homework #8 How Neurons Work (1 of 3): Neuron Structure and Resting Potential (BioFlix tutorial) Part B- lon movements at resting potential The diagram below shows the five main transport proteins that control the distribution of Na" and Kt ions across the plasma membrane of an axon. the membrane is at resting potential-the membrane potential of the axon remains constant at about-70 mV Assume that Drag the arrows onto the diagram to show the direction of Na*...
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of the cell. Then sodium channels close and potassium (K+) rushes out of the cell, causing of the cell. However, the potassium overshoots and causes Question 5 2 pts During the refractory period, the pumps Na+ ions out of the cell and K+ions into the cell, re-establishing the resting membrane potential and concentration gradient. Serotonin Acetylcholine Glutamate Endorphins Barbiturates GABA Dopamine Cocaine Sodium Potassium Calcium...
In its resting state, the membrane surrounding a neuron is
permeable to potassium ions but only slightly permeable to sodium
ions. Thus, positive K ions can flow through the membrane in an
attempt to equalize K concentration, but Na ions cannot as quickly.
This leads to an excess of Na ions outside of the cell. If the
space outside the cell is defined as zero electric potential, then
the electric potential of the interior of the cell is negative.
This...
Match each event with the action that follows it. Drag each item on the left to its matching item on the right. The cell returns to resting potential. Sodium and potassium gates close. Neuron receives inhibitory chemicals. The cell depolarizes. The cell hyperpolarizes. Sodium gates open.* Potassium gates open.** Neuron receives excitatory chemicals. * Sodium ions rush into the cell. Potassium ions rush out of the cell.
This time you get into a snail brain neuron that is
completely quiet. The cell doesn't even begin to fire action
potentials when you inject depolarizing current, so you question
yourself if you are actually in a neuron. Nevertheless, you briefly
hyperpolarize thecell, and right after the hyperpolarization stops,
the cell fires a few action potentials that have a quite large
amplitude and then the cell becomes quite again. What could be
going on here? Your traces kind of look...
Use what you know about the physiology of neurons to answer the following questions. Treat each of these questions as unrelated to each other. a. Imagine that a mutation makes Na* leak channels just as common as K' leak channels. Explain the effect of this mutation on the resting potential of this neuron. 3. b. The intracellular:extracellular ratio of K' ions is normally 150:4mM. Imagine that you decrease that ratio to 150: 20mM. Describe the subsequent effect on the resting...
lg0i0oyy.chUmycvitemiew assignmentProblemID-105296236 < Homework #8 How Neurons Work (1 of 3): Neuron Structure and Resting Potential (BioFlix tutorial) Part B- lon movements at resting potential The diagram below shows the five main transport proteins that control the distribution of Na" and Kt ions across the plasma membrane of an axon. the membrane is at resting potential-the membrane potential of the axon remains constant at about-70 mV Assume that Drag the arrows onto the diagram to show the direction of Na*...
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