Multiple Choice
Which of the following statements is true regarding cross-bridges?
A) A cross-bridge is the basic unit of active muscle tension.
B) A cross-bridge is formed when head groups on the actin myofilament bind with tropomyosin on the myosin filament.
C) Cross-bridges do not occur in lengthening contractions.
D) A release of sodium is necessary to reveal the binding site on the actin.
Correct Answer:
Verified
Correct Answer:
Verified
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