Absolute refractory period in heart______________?
Correct answer: B. All of the above
- A. Lasts till cardiac contraction
- B. All of the above
- C. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus
- D. Corresponds with duration of action potential
- E. Longer than refractory period in skeletal muscle
Explanation
The cardiac absolute refractory period lasts through most of the action potential and contraction, is longer than in skeletal muscle, and prevents excitation by any stimulus during that interval. Therefore, all listed statements are intended to be correct.
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