The impulse that triggers a contraction travels deep into a muscle fiber by mleans of

myofibrils are composed primarily of

The enzyme cholinesterase causes acetylcholine to

Creatine phosphate serves to

ADP molecules on the surface of actin serve as active sites for the formation of cross bridges with molecules of

The amount of oxygen needed to support the conversion of lactic acid to glucose is called the

a muscle cramp is likely due to a lack of

An example of a partial but sustained contraction would be

Compared to skeletal muscle, smooth muscle

A motor unit includes

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