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AfilCa [17]
3 years ago
14

Depolarization of the sarcolemma means

Health
1 answer:
zhannawk [14.2K]3 years ago
4 0

Answer:

Depolarization of the sarcolemma means that the inside of the membrane has become less negative as sodium ions accumulate.

Explanation:

Depolarization consists of a decrease in membrane potential, promoted by the movement of ions that generates a change in this membrane potential at the intracellular level.

At rest, the intracellular space tends to have a negative membrane potential, with respect to the extracellular one. <u>The </u><u>entrance of sodium ions</u><u> (Na⁺) through the membrane produces a change, in which the intracellular membrane potential will be less negative</u>.

In the sarcolemma, the entrance of Na⁺ ions produces a decrease of the negativity of the membrane potential, with the exit of intracellular calcium, by the sarcoplasmic reticulum. This is the mechanism responsible for initiating muscle contraction.

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