ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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channels in cardiac muscle fiber memebranes in the sinoatrial node that open when a threshold of-40 mV is reached are
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L-type
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T-type
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K+ channels
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F-type sodium channels
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Explanation:
Detailed explanation-1: -The fast sodium channel These sodium channels are voltage-dependent, opening rapidly due to depolarization of the membrane, which usually occurs from neighboring cells, through gap junctions. They allow for a rapid flow of sodium into the cell, depolarizing the membrane completely and initiating an action potential.
Detailed explanation-2: -Sinoatrial (SA) node fibers possess the ability to depolarize spontaneously until a threshold potential of about −40 mV is reached, which generates a new action potential (Fig. 2.3).
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