Multiple Choice
Which of the following is true with regard to sodium and potassium in the human body?
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11. Nervous Tissue and Nervous System
Ions - Sodium and Potassium
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Which of the following accurately describes the gates of voltage-gated sodium channels?
A
They have a single gate that opens and closes in response to voltage changes.
B
They have no gates and rely solely on concentration gradients.
C
They have three gates: an activation gate, an inactivation gate, and a modulation gate.
D
They have two gates: an activation gate and an inactivation gate.
Verified step by step guidance1
Understand the function of voltage-gated sodium channels: These channels are crucial for the initiation and propagation of action potentials in neurons.
Recognize that voltage-gated sodium channels are responsible for the rapid depolarization phase of the action potential.
Identify the components of the voltage-gated sodium channel: It has two main gates, the activation gate and the inactivation gate.
The activation gate opens in response to a change in membrane potential, allowing sodium ions to enter the cell, leading to depolarization.
The inactivation gate closes shortly after the activation gate opens, stopping the influx of sodium ions and allowing the cell to repolarize.
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