Question 1

Which structure surrounds a single skeletal muscle fiber and provides support and insulation?

Accepted Answer

Endomysium

Question 2

A muscle fiber is defined as:

Accepted Answer

A single muscle cell

Question 3

Which of the following is the smallest functional (contractile) unit of skeletal muscle?

Accepted Answer

Sarcomere

Question 4

Skeletal muscle cells are unique because they:

Accepted Answer

Are multinucleated with nuclei at the periphery

Question 5

Which muscle is responsible for forming the 'six-pack' appearance in the abdomen?

Accepted Answer

Rectus abdominis

Question 6

The rotator cuff muscles are remembered by the acronym SITS. Which of the following is NOT part of the rotator cuff?

Accepted Answer

Teres major

Question 7

Which muscle helps you cross your legs, as in sitting in a yoga pose?

Accepted Answer

Sartorius

Question 8

If a patient has difficulty flexing their forearm, which muscle is most likely affected?

Accepted Answer

Biceps brachii

Question 9

Which structure is the plasma membrane of a skeletal muscle cell?

Accepted Answer

Sarcolemma

Question 10

A motor neuron communicates with a muscle fiber at which specialized site?

Accepted Answer

Neuromuscular junction (NMJ)

Question 11

Which muscle forms the calf and is important for plantar flexion during walking?

Accepted Answer

Gastrocnemius

Question 12

Which of the following muscles is located in the posterior forearm and is involved in extension of the wrist?

Accepted Answer

Extensor carpi radialis longus

Question 13

Which muscle is responsible for elevating the scapula, such as when shrugging your shoulders?

Accepted Answer

Levator scapulae

Question 14

Which muscle group is found on the front of the leg and is primarily responsible for extension of the toes?

Accepted Answer

Extensor muscle group

Question 15

A patient presents with difficulty breathing due to impaired contraction of the primary muscle of inspiration. Which muscle is most likely affected?

Accepted Answer

Diaphragm

Question 16

Which of the following is a deep muscle of the back that helps extend the vertebral column?

Accepted Answer

Longissimus thoracis

Question 17

Which muscle is part of the quadriceps group and is located in the middle of the thigh?

Accepted Answer

Rectus femoris

Question 18

Which anatomical feature distinguishes cardiac muscle from skeletal muscle?

Accepted Answer

Presence of intercalated discs

Question 19

If a muscle fiber contains $$n$$ nuclei, and each nucleus controls a region of cytoplasm called a myonuclear domain, which equation best describes the total cytoplasmic volume $$V as a $$function of the number of nuclei $$n$$ and the average domain volume $$v$$?

Accepted Answer

$$V = n 	imes v$$

Question 20

A patient suffers a laceration to the forearm and loses function in the flexor muscle group. Which region of the forearm is most likely affected?

Accepted Answer

Anterior forearm

Muscular System: Anatomy & Physiology I Lab Practicum Study Guide

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