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ATI LPN · Anatomy and Physiology · Muscular System Test Questions and Answers

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

All of the following structures are part of a muscle cell except one. Which one?

A. sarcoma

B. sarcolemma

C. sarcoplasm

D. sarcoplasmic reticulum

Correct Answer: sarcoma

Question 2 of 5

Protrusion of an organ through a structure that normally contains it is referred to as a

A. hernia

B. goitre

C. strain

D. sprain

Correct Answer: hernia

Question 3 of 5

Which statement about thick or thin myofilaments is CORRECT?

A. Thick myofilaments contain the three proteins myosin, tropomyosin and troponin

B. Thin myofilaments contain the three proteins actin, tropomyosin and troponin

C. Thick myofilaments contain about 300 myosin molecules each of which has a binding site for a cross bridge

D. Thin myofilaments contain about 300 myosin molecules each of which has a cross bridge

Correct Answer: Thin myofilaments contain the three proteins actin, tropomyosin and troponin

Question 4 of 5

What the largest endogenous substrate source in the body?

A. Liver glycogen

B. Muscle glycogen

C. Intramuscular lipid

D. Adipose tissue

Correct Answer: Adipose tissue

Question 5 of 5

Which fatigue more quickly, slow twitch fibers or fast twitch fibers?

A. slow

B. fast

C. fatigue at same rate

D. they do not fatigue

Correct Answer: fast

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