Question 1

Which of the following best describes the role of calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$during skeletal muscle contraction according to the sliding filament theory?

Accepted Answer

Calcium binds to troponin, causing tropomyosin to move and expose actin binding sites.

Question 2

A patient is unable to dorsiflex their foot after a sports injury. Which muscle is most likely impaired?

Accepted Answer

Tibialis anterior

Question 3

Which connective tissue layer directly surrounds a fascicle (a bundle of muscle fibers)?

Accepted Answer

Perimysium

Question 4

During a biceps curl, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 5

Which of the following statements about the sarcomere is correct?

Accepted Answer

The Z disc marks the boundary of a sarcomere.

Question 6

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

Accepted Answer

Deltoid

Question 7

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle produces tension without changing length.

Question 8

Which enzyme is responsible for breaking down acetylcholine ($$\mathrm{ACh}) at $$the neuromuscular junction?

Accepted Answer

Acetylcholinesterase

Question 9

Which muscle group is primarily responsible for extending the knee?

Accepted Answer

Quadriceps

Question 10

A patient presents with difficulty stabilizing their shoulder joint after a rotator cuff injury. Which muscle is NOT part of the rotator cuff?

Accepted Answer

Deltoid

Question 11

Which of the following best explains why ATP is necessary for muscle contraction and relaxation?

Accepted Answer

ATP allows myosin heads to detach from actin after the power stroke.

Question 12

Which movement describes turning the palm so it faces downward?

Accepted Answer

Pronation

Question 13

Which muscle is the prime mover (agonist) for flexing the elbow?

Accepted Answer

Biceps brachii

Question 14

A muscle named 'flexor carpi radialis' is likely named for which of the following reasons?

Accepted Answer

Its action and location

Question 15

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

It is involuntary and found only in the heart.

Question 16

If a muscle acts as a fixator during a movement, what is its primary function?

Accepted Answer

To stabilize a bone or joint

Question 17

Which of the following best describes the difference between the origin and insertion of a muscle?

Accepted Answer

The origin is the less movable attachment; the insertion is more movable.

Question 18

Which muscle is primarily responsible for closing the jaw during chewing?

Accepted Answer

Masseter

Question 19

A soccer player suffers a hamstring injury. Which action will be most affected?

Accepted Answer

Flexing the knee

Question 20

Which of the following correctly matches the muscle with its main function?

Accepted Answer

Rectus abdominis – flexes the trunk

Muscular System: Structure, Function, and Major Muscles (Chapters 9 & 10 Study Guide)

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