McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What are the striations of muscle fibers composed of?

A. tubulin subunits
B. sarcoplasmic reticulum
C. overlapping myofilaments containing actin and myosin
D. filaments of troponin and tropomyosin


2. What is the contractile unit of muscle tissue?

A. an entire muscle
B. a myofilament
C. a motor unit
D. a sarcomere
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