During depolarization, which of the following statements about voltage-gated ion channels is TRUE
A) K+ gates open before Nat gates
B) Na+ gates open before it gates
C) Na+ and K+ gates open at the same time
D) Na+ gates open while Kt gates remain closed
E) K+ gates open while Nat gates remain closed

Question

07-02-2020
Biology

contestada

During depolarization, which of the following statements about voltage-gated ion channels is TRUE
A) K+ gates open before Nat gates
B) Na+ gates open before it gates
C) Na+ and K+ gates open at the same time
D) Na+ gates open while Kt gates remain closed
E) K+ gates open while Nat gates remain closed

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josinclair73 josinclair73 · Answer 1 · 2020-02-13T05:09:44+01:00

Answer:

In relation to voltage-gated ion channels, when depolarization occurs, Na⁺ gates open while K⁺ gates remain closed.

Explanation:

Depolarization is a phenomenon that occurs in cells like neurons, and depends on the distribution of ions in extracellular spaces and intraceluar.

Na⁺ is a predominantly extracellular cation.
K⁺ has a high intracellular concentration.

This distribution occurs when the membrane potential is at rest, with a negative intracellular value.

Depolarization involves opening the Na⁺ channels, so that this cation enters the intracellular space, causing a change in cell voltage. Increasing Na⁺ concentration in intracellular space progressively produces an action potential, resulting in an electrical signal.

While depolarization occurs, K⁺ channels remain closed, limiting the output of this cation to extracellular space, which would prevent the action potential from occurring.

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