Question 1

Which of the following is a characteristic unique to skeletal muscle tissue compared to cardiac and smooth muscle?

Accepted Answer

Is under voluntary control and is multi-nucleated

Question 2

The functional contractile unit of a skeletal muscle fiber is called the:

Accepted Answer

Sarcomere

Question 3

Which region of the sarcomere contains only thick filaments and no thin filaments?

Accepted Answer

H zone

Question 4

During muscle contraction, calcium ions are released from which structure?

Accepted Answer

Terminal cisternae of the sarcoplasmic reticulum

Question 5

Which connective tissue layer directly surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 6

A motor unit consists of:

Accepted Answer

A motor neuron and all the muscle fibers it stimulates

Question 7

Which of the following best describes the role of the neurotransmitter acetylcholine at the neuromuscular junction?

Accepted Answer

It depolarizes the sarcolemma by binding to sodium channels

Question 8

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

Accepted Answer

Brachialis

Question 9

If a muscle fiber receives a subthreshold stimulus, what is the expected response?

Accepted Answer

No contraction occurs

Question 10

Which of the following best explains the concept of 'recruitment' in skeletal muscle physiology?

Accepted Answer

Activating additional motor units to increase contractile strength

Question 11

Which band of the sarcomere shortens during muscle contraction?

Accepted Answer

I band

Question 12

What is the correct order of connective tissue layers from innermost to outermost in a skeletal muscle?

Accepted Answer

Endomysium, Perimysium, Epimysium

Question 13

Which muscle is responsible for closing the jaw during mastication?

Accepted Answer

Masseter

Question 14

A patient is unable to raise the corners of their mouth upward. Which muscle is most likely impaired?

Accepted Answer

Zygomaticus

Question 15

Which of the following describes an isometric muscle contraction?

Accepted Answer

The muscle length does not change, but tension increases

Question 16

Which equation best represents the relationship between force ($$F$$), mass ($$m$$), and acceleration ($$a) in $$the context of muscle contraction moving an object?

Accepted Answer

$$F = m 	imes a$$

Question 17

During the action potential of a muscle fiber, which ion's influx is primarily responsible for depolarization?

Accepted Answer

Sodium ($$Na^+)$$

Question 18

Which muscle acts as a synergist with the masseter during jaw closure?

Accepted Answer

Temporalis

Question 19

Which term describes the attachment of a muscle to the stationary bone?

Accepted Answer

Origin

Question 20

A muscle named 'biceps' has how many heads?

Accepted Answer

Two

Microscopic and Gross Anatomy of Skeletal Muscle

Guida di studio - Domande di pratica

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