What is a cross-bridge?
A. The combination of myosin heads with active sites on actin molecules
B. The movement of myosin head while attached to actin myofilament
C. A T tubule and two adjacent terminal cisternae
D. A protein found along the groove of the F-actin double helix
E. After exercise, the O2 taken in that exceeds the O2 required for resting metabolism
Answer: A
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