The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential.

The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 1RE: Conformational changes in channel proteins brought about by voltage changes are responsible for...

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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

The action potential is split into 4 parts (A-D).
For each part,
1. Describe what stimulated the channel responsible for this part,
2. what is the likely ion that is moving and
3. explain which direction the ion had to move to create the measured membrane potential.

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Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)
The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential. +40 B D membrane potential (mV) -40 -60 A { 2 time (ms)
In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. Discuss the importance of threshold. How does this relate to the concept of APs being all or none?
Why do voltage-gated sodium channels have three states (open, closed, refractory/open-block)? Select all that apply. Select one or more answers and submit. For keyboard navigation... SHOW MORE ✓ a b с Multiple answers: Multiple answers are accepted for this question d To keep action potentials from going backwards To speed up the refractory period To prevent the channels from opening during repolarization To allow hyperpolarization to occur Answered Resubmit
Membrane Potential (mV) +35 0 -50 -70 0 A B C | 2 Time (milliseconds) 3 E 4 Use the figure showing phases of the action potential to answer the following question. Most of the voltage-gated sodium channels become open at label ____, and become inactivated at label
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The figure below may help in answering some of the questions. 1. What ions are flowing (and in which direction) both during the rising phase and the falling phase of the action potential? 2. What are the values of both the 'y' (vertical) axis and the 'x' (horizontal) axis. 3. If extracellular levels of K+ rose (a condition called hyperkalemia), how would that affect the resting membrane potential? 3
Figure I shows a schematic of an action potential. How do voltage-gated sodium channels contribute to stages 1, 3 and 6? In your answer, state what happens to the activation and inactivation gates at these three stages. Membrane Potential (mV) 50 -50 -100 -2 t 1 T T 2 3 Time (milliseconds) T 0 1 Figure 1 1 4 51 T T 5 6 7
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