For an Axon at Resting Membrane Potential, the K⁺ Leak

question 16

Multiple Choice

For an axon at resting membrane potential, the K⁺ leak channel is _______, the voltage-gated Na⁺ channel is _______, and the voltage-gated K⁺ channel is _______.

• A) open; inactivated; closed
• B) closed; inactivated; closed
• C) open; inactivated; open
• D) open; closed; closed

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Definitions:

Osmotic Pressure

The pressure required to prevent the flow of a solvent into a solution through a semipermeable membrane, driven by differences in solute concentration.

Selectively Permeable Membrane

A barrier that allows certain molecules or ions to pass through it by diffusion and occasionally specialized processes.

Osmosis

The movement of water molecules through a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration to equalize the concentrations on both sides of the membrane.

Active Transport

Transport of molecules across the membrane of a cell from areas where they are less concentrated to areas where they are more concentrated, which demands energy.