Contraction of cardiac muscle typically requires:
A) Ca++ influx through voltage-gated Ca++ channels to trigger a rise in cytosolic [Ca++].
B) Ca++ influx through voltage-gated Ca++ channels,which is sufficient to support contraction.
C) Activation of myosin light-chain kinase (MLCK) .
D) Phosphorylation of myosin heavy chain.
E) Ca++ influx through the Na+-Ca++ antiporter.
Correct Answer:
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