Why Can't Tetany of the Heart Occur Under Normal Conditions

question 42

Multiple Choice

Why can't tetany of the heart occur under normal conditions?

• A)There are no distinct motor units in the heart.
• B)There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction.
• C) The refractory period in cardiac muscle lasts almost as long as the duration of the resultant contraction.
• D) The heart contracts with maximal force every beat so it is impossible to increase the strength of the cardiac contraction.

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Definitions:

Lifetime Risk

Lifetime risk is the probability of an individual developing a certain disease or condition over the course of their lifetime, taking into account various demographic factors.

Cardiovascular Disease

A class of diseases that involve the heart or blood vessels, including coronary artery disease, hypertension, and stroke.

Women

Adult human females.

Modifiable Risk Factors

Aspects of personal behavior or lifestyle, environmental exposure, or genetic susceptibility that can be altered to reduce the risk of disease.