he entire membrane does not depolarize at the same time. Instead, an action potential is propagated from one segment of the nembrane to the next down the length of the axon. Fill in the blanks of the following statements that explain aspects of an action potential. three msec for a segment of It takes approximately membrane to depolarize then repolarize back to rest. resting previous While a segment of membrane is repolarizing, the next segment towards the terminal end of the axon is four Threshold is the membrane potential at which voltage-gated sodium channels will open. The voltage-gated sodium channels for a specific segment of membrane are triggered to open by the change in membrane potential of the repolarizing segment of membrane. To start another action potential, segment A must be at membrane potential. depolarizing

he entire membrane does not depolarize at the same time. Instead, an action potential is propagated from one segment of the nembrane to the next down the length of the axon. Fill in the blanks of the following statements that explain aspects of an action potential. three msec for a segment of It takes approximately membrane to depolarize then repolarize back to rest. resting previous While a segment of membrane is repolarizing, the next segment towards the terminal end of the axon is four Threshold is the membrane potential at which voltage-gated sodium channels will open. The voltage-gated sodium channels for a specific segment of membrane are triggered to open by the change in membrane potential of the repolarizing segment of membrane. To start another action potential, segment A must be at membrane potential. depolarizing

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 17RE

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Similar questions

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 accelerating flow of _______ ions through gated channels across the membrane triggers an action potential. a. potassium b. sodium c. hydrogen d. a and b
Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed
A membrane potential (Vm) labeled axis on the graph In the graph draw the phases of the action potential Include the channels involved and when they open and close matching them to the Vm Indicate the periods in which the action potential can or cannot occur
The membrane voltage in graded potentials can be produced by Oopen channels and ligand-gated chanels Ovoltage-gated channels Oligand-gated and mechanically gated channels Oligand-gated channels mechanically gated channels
Membrane permeability at the rising phase of an action potential is dominated by: O Co-transporters Nongated Channels O K+ Voltage-gated Channels O Na+ voltage-gated Channels O Chemically-gated Channels
Which of the following is not an excitatory ligand-gated ion channel? NACHR AMPAR ASIC GABA-AR
A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next
When a membrane is at rest, which channels are open? O Voltage-gated calcium channels O Voltage-gated potassium channels Leaky potassium channels O All the channels listed are open O Votlage-gated sodium channels
Which of the following occurs immediately after the peak of an action potential? The membrane potential begins to repolarize O Voltage gated potassium channels are open Ⓒ Voltage gated sodium channels are inactivated The cell is in the absolute refractory period All of the above
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
The trigger for an action potential is: Osodium Opotassium O sodium and potassium O the voltage-gated sodium channels are closed O the threshold potential