Question 1

Which of the following is NOT a primary function of muscle tissue in the human body?

Accepted Answer

Hormone Secretion: Muscles secrete hormones that regulate metabolism.

Question 2

A patient is unable to voluntarily contract their heart muscle. Which type of muscle tissue is affected, and what is its normal control mechanism?

Accepted Answer

Cardiac muscle; controlled involuntarily

Question 3

Which characteristic is shared by all muscle tissues and allows them to respond to nervous stimulation?

Accepted Answer

Excitability

Question 4

During muscle contraction, which ion binds to troponin to trigger the process?

Accepted Answer

Ca	extsuperscript{2+}

Question 5

A soccer player suffers a torn Achilles tendon. Which anatomical structure is directly affected?

Accepted Answer

Calcaneal tendon

Question 6

Which layer of connective tissue surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 7

A patient presents with paralysis of the forearm flexors and thumb muscles. Which nerve is most likely damaged?

Accepted Answer

Median nerve

Question 8

Which muscle shape is best suited for generating the greatest force due to its arrangement of fibers?

Accepted Answer

Pennate

Question 9

Which of the following best describes the role of the antagonist muscle during movement?

Accepted Answer

It opposes the action of the agonist.

Question 10

Which of the following equations correctly represents the electrical potential difference across a muscle cell membrane at rest?

Accepted Answer

$$ V_{rest} = V_{inside} - V_{outside} $$

Question 11

Which muscle is primarily responsible for flexing the trunk during a sit-up?

Accepted Answer

Rectus abdominis

Question 12

A patient is unable to extend their knee after an injury. Which muscle group is most likely affected?

Accepted Answer

Quadriceps

Question 13

Which of the following best describes the function of the neuromuscular junction (NMJ)?

Accepted Answer

It transmits nerve signals to muscle fibers, initiating contraction.

Question 14

Which of the following muscle types is responsible for involuntary contraction of internal organs such as the digestive tract?

Accepted Answer

Smooth muscle

Question 15

If the sarcomere shortens during contraction, which bands decrease in length?

Accepted Answer

I band and H zone

Question 16

Which of the following is the smallest functional unit of a muscle fiber?

Accepted Answer

Sarcomere

Question 17

A patient with damage to the radial nerve would most likely experience difficulty with which movement?

Accepted Answer

Extending the forearm

Question 18

Which equation best represents the relationship between force ($$F$$), cross-sectional area ($$A$$), and stress ($$\sigma) in $$muscle physiology?

Accepted Answer

$$ \sigma = \frac{F}{A} $$

Question 19

Which muscle is the primary muscle for respiration?

Accepted Answer

Diaphragm

Question 20

A patient is unable to abduct their arm at the shoulder. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Muscular System: Structure, Function, and Surface Anatomy

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