THORAX ABDOMEN AND PELVIS

MEDICAL

HEART AND PERICARDIUM

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Throughout the contractile fibers phases, another action potential cannot occurs normally. This is called?

A	Dysrhythmia
B	Muscle Tension
C	Resting Membrane Potential
D	Absolute Refractory Period

Explanation:

Detailed explanation-1: -The period when the majority of sodium channels remain in the inactive state is the absolute refractory period. After this period, there are enough voltage-activated sodium channels in the closed (active) state to respond to depolarization.

Detailed explanation-2: -The entire event lasts between 250 and 300 ms ([link]). The absolute refractory period for cardiac contractile muscle lasts approximately 200 ms, and the relative refractory period lasts approximately 50 ms, for a total of 250 ms.

Detailed explanation-3: -The absolute refractory period begins with depolarization and extends into the final repolarization phase. During the absolute refractory period, the cardiac muscle cell is completely insensitive to further stimulation. The relative refractory period occurs during the last part of the final repolarization phase.

There is 1 question to complete.