A reduction in extracellular Ca2+ levels would lead to
A. decreased force of cardiac muscle contraction due to a lack of release of Ca2+ from the sarcoplasmic reticulum.
B. heart block due to depolarization of the sarcolemma.
C. increased force of cardiac muscle contraction due to increased interactions between actin and myosin.
D. heart block due to hyperpolarization of the sarcolemma.
Answer: A
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