Multiple Choice
An action potential is __________.
45. Nervous System
Neurons and Action Potentials
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Blocking potassium ion channels in a mammalian cell membrane would __________.
A
increase the resting potential
B
increase potassium's equilibrium potential
C
decrease sodium's equilibrium potential
D
increase the magnitude of the membrane potential
E
decrease the magnitude of the membrane potential
Verified step by step guidance1
Understand the role of potassium ion channels: Potassium ion channels are crucial for maintaining the resting membrane potential in cells by allowing potassium ions (K⁺) to move out of the cell, which helps balance the charge across the membrane.
Consider the effect of blocking potassium ion channels: If these channels are blocked, potassium ions cannot exit the cell as they normally would, which affects the distribution of charge across the membrane.
Analyze the impact on membrane potential: Normally, the movement of K⁺ out of the cell makes the inside of the cell more negative. Blocking these channels would prevent this movement, leading to a less negative (or more positive) inside compared to the outside.
Relate to membrane potential magnitude: The membrane potential is the difference in charge across the cell membrane. If the inside becomes less negative due to blocked K⁺ channels, the difference in charge (magnitude of membrane potential) decreases.
Conclude the effect: Therefore, blocking potassium ion channels would decrease the magnitude of the membrane potential, as the charge difference across the membrane is reduced.
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