What Is the Functional Significance of Large Areas of Cardiac

question 172

Multiple Choice

What is the functional significance of large areas of cardiac muscle being electrically coupled to form a single functional syncytium?

• A) Because they form a syncytium, cardiac muscles can contract on their own.
• B) Because they form a syncytium, muscle cells can pass an action potential along a large area of the heart wall, stimulating contraction in each muscle fiber of the syncytium.
• C) Because they form a syncytium, muscle cells cannot summate contraction to produce tetanus and thus not fatigue.
• D) Because they form a syncytium, cardiac muscle cells can pass an action potential by way of internodal bundles contracting both atrial chambers.

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