Question 1

Which of the following is NOT a function of the muscular system?

Accepted Answer

Synthesis of hormones

Question 2

A patient is unable to voluntarily move their arm but their heart and digestive tract continue to function normally. Which type of muscle tissue is most likely affected?

Accepted Answer

Skeletal muscle

Question 3

Which of the following statements about muscle tissue terminology is CORRECT?

Accepted Answer

The endoplasmic reticulum in muscle fibers is called the sarcoplasmic reticulum.

Question 4

Which protein is primarily responsible for the elasticity and stabilization of the sarcomere after it has been stretched?

Accepted Answer

Titin

Question 5

A laboratory test reveals elevated troponin levels in a patient. What does this most likely indicate?

Accepted Answer

The patient has experienced muscle damage, likely in the heart.

Question 6

Which of the following best describes the structure and function of the sarcomere?

Accepted Answer

It is the region between two successive Z discs and is the smallest contractile unit of a muscle fiber.

Question 7

Which of the following is TRUE regarding the differences between skeletal, cardiac, and smooth muscle?

Accepted Answer

Skeletal muscle fibers are multinucleated and striated.

Question 8

Which connective tissue layer directly surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 9

A muscle contraction is initiated when calcium ions are released from which structure?

Accepted Answer

Sarcoplasmic reticulum

Question 10

Which protein covers the myosin binding sites on actin in a resting muscle?

Accepted Answer

Tropomyosin

Question 11

Which of the following best describes the role of the T tubules in skeletal muscle fibers?

Accepted Answer

They are extensions of the sarcolemma that conduct action potentials deep into the muscle fiber.

Question 12

Which of the following is a regulatory protein that holds tropomyosin in place on the thin filament?

Accepted Answer

Troponin

Question 13

A muscle fiber is observed under a microscope and found to be branched, have faint striations, and contain intercalated discs. Which type of muscle is this?

Accepted Answer

Cardiac muscle

Question 14

Which of the following correctly matches the muscle structure with its description?

Accepted Answer

Myofibril: main intracellular contractile structure of muscle fibers

Question 15

Which protein is the major component of thick filaments in a myofibril?

Accepted Answer

Myosin

Question 16

Which of the following best explains why skeletal muscle fibers are multinucleated?

Accepted Answer

They are formed by the fusion of multiple precursor cells during development.

Question 17

Which connective tissue layer surrounds groups of muscle fibers and forms fascicles?

Accepted Answer

Perimysium

Question 18

Which of the following is TRUE regarding the relationship between the sarcolemma, tendon, and movement?

Accepted Answer

The sarcolemma is attached to the tendon, so when the myofibril contracts, the tendon is pulled, resulting in movement.

Question 19

Which of the following best describes the function of nebulin in the sarcomere?

Accepted Answer

It helps hold F actin fibers together.

Question 20

A muscle biopsy reveals fibers with a single nucleus, tapered ends, and no striations. Where is this muscle most likely found?

Accepted Answer

Lining blood vessels

The Muscular System: Structure and Function

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