Question

question 32
myosin _______________ reach up and bind to a binding site on actin during a muscle contraction sequence.
a thick
b cross - bridges
c actin
d tropomyosin

Explanation:

During muscle contraction, myosin cross - bridges bind to actin. Myosin is a thick filament protein. Actin is the thin filament. Tropomyosin covers the binding sites on actin in the resting state. The key concept here is the role of myosin cross - bridges in the sliding filament theory of muscle contraction.

Answer:

B. cross - bridges