Question 1

Which connective tissue layer directly surrounds individual skeletal muscle fibers?

Accepted Answer

Endomysium

Question 2

During muscle contraction, which ion is released from the sarcoplasmic reticulum to initiate the process?

Accepted Answer

Calcium ($$Ca^{2+})$$

Question 3

Which of the following is the basic functional unit of a skeletal muscle?

Accepted Answer

Sarcomere

Question 4

What is the main neurotransmitter released at the neuromuscular junction to stimulate muscle contraction?

Accepted Answer

Acetylcholine

Question 5

Which structure is a specialized form of smooth endoplasmic reticulum that stores calcium ions in skeletal muscle fibers?

Accepted Answer

Sarcoplasmic reticulum

Question 6

Which protein forms the thick filaments in a sarcomere?

Accepted Answer

Myosin

Question 7

Which connective tissue layer surrounds a muscle fascicle?

Accepted Answer

Perimysium

Question 8

Which of the following is NOT a function of skeletal muscle?

Accepted Answer

Production of lymphocytes

Question 9

Which of the following best describes the sliding filament theory of muscle contraction?

Accepted Answer

Actin and myosin filaments slide past each other, shortening the sarcomere

Question 10

Which structure transmits electrical impulses deep into the muscle fiber to trigger calcium release?

Accepted Answer

Transverse (T) tubule

Question 11

Which of the following is true regarding motor units in skeletal muscle?

Accepted Answer

A motor unit consists of one neuron and all the muscle fibers it innervates

Question 12

Which of the following is a real-life example of antagonistic muscle pairs?

Accepted Answer

Biceps brachii and triceps brachii during elbow flexion and extension

Question 13

Which of the following best describes the role of troponin in muscle contraction?

Accepted Answer

Troponin binds calcium, causing tropomyosin to move and expose actin binding sites

Question 14

If a patient has a genetic defect in the production of acetylcholine receptors, which process would be most directly affected?

Accepted Answer

Transmission of the action potential across the neuromuscular junction

Question 15

Which of the following is the correct sequence of events in excitation-contraction coupling?

Accepted Answer

Action potential → calcium release → troponin activation → cross-bridge formation

Question 16

Which of the following is a synergist muscle during elbow flexion?

Accepted Answer

Brachioradialis

Question 17

Which of the following statements about the organization of skeletal muscle is correct?

Accepted Answer

A fascicle is surrounded by perimysium

Question 18

Which of the following best explains why skeletal muscle helps maintain body temperature?

Accepted Answer

Muscle contraction generates heat as a byproduct of ATP hydrolysis: $$ATP ightarrow ADP + P_i + 	ext{energy}$$

Question 19

Which of the following is true regarding the attachment points of skeletal muscle?

Accepted Answer

The insertion is pulled toward the origin during contraction

Question 20

A patient is unable to relax their muscles after contraction. Which protein is most likely malfunctioning?

Accepted Answer

Tropomyosin

The Muscular System: Structure, Function, and Organization

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