Mammalian Cardiac Muscle Cells Are Stimulated to Contract by

question 43

Multiple Choice

Mammalian cardiac muscle cells are stimulated to contract by

• A) hormonal signals that trigger Ca²⁺ release and myosin light-chain phosphorylation.
• B) electrical signals transmitted through gap junctions from other autorhythmic cardiac muscle cells.
• C) action potentials from excitatory autonomic neurons.
• D) ion channels that open in response to stretch of the cardiac muscle cell membranes.

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