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ATI LPN · Anatomy and Physiology · Questions About the Muscular System

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

Extensions of the sarcolemma that go deep into the muscle fiber are the

A. T-tubules

B. sarcoplasmic reticulum

C. myofibrils

D. sarcomeres

Correct Answer: T-tubules

Question 2 of 5

Which of the following muscle cell structures is the longest?

A. A myofilament

B. A myofibril

C. A sarcomere

D. A troponin molecule

Correct Answer: A myofibril

Question 3 of 5

Identify the group of muscles on the anterior thigh.

A. Abductor group

B. Adductor group

C. Hamstring group

D. Quadriceps group

Correct Answer: Quadriceps group

Question 4 of 5

Which muscle name does not make sense?

A. extensor digitorum

B. gluteus minimus

C. biceps femoris

D. extensor minimus longus

Correct Answer: extensor minimus longus

Question 5 of 5

What is the role of acetylcholine in muscle cell contraction?

A. it is a neurotransmitter

B. it binds to troponin causing it to change shape

C. it supplies the energy for contraction

D. it engages with the binding site on actin

Correct Answer: it is a neurotransmitter