The absolute refractory period in the ventricles A. Is the period whe

1.	The absolute refractory period in the ventricles A. Is the period when the ventricles are completely inexcitable. B. Corresponds to the period of ventricular depolarization. C. Corresponds approximately to the period of ventricular contraction. D. Is shorter than the corresponding period in atrial muscle. E. Decreases during sympathetic stimulation of the heart.
Answer» A. True This is the definition. B. True Depolarized cells cannot be excited. C. True This prevents tetanic contraction of the heart. D. False It is longer, as is the duration of its depolarization. E. True Shortening the refractory period permits higher heart rates.

The absolute refractory period in the ventricles A. Is the period when the ventricles are completely inexcitable. B. Corresponds to the period of ventricular depolarization. C. Corresponds approximately to the period of ventricular contraction. D. Is shorter than the corresponding period in atrial muscle. E. Decreases during sympathetic stimulation of the heart.

Answer»

A. True This is the definition.

B. True Depolarized cells cannot be excited.

C. True This prevents tetanic contraction of the heart.

D. False It is longer, as is the duration of its depolarization.

E. True Shortening the refractory period permits higher heart rates.

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