Question

1. a sarcomere is best described as

a) a group of fascicles.
b) a part of the sarcoplasmic reticulum.
c) repeating, contractile units of muscle.
d) a single motor neuron and all the muscle fibers it controls.

Explanation:

A sarcomere is the basic repeating, contractile unit of muscle. Fascicles are groups of muscle fibers. The sarcoplasmic reticulum is involved in calcium - storage in muscle cells. A motor unit is a single motor neuron and all the muscle fibers it controls.

Answer:

C. repeating, contractile units of muscle.