Question 1

Which of the following best explains why skeletal muscle is also called 'voluntary muscle'?

Accepted Answer

Its contractions can be consciously controlled by the individual.

Question 2

A patient is unable to extend their forearm at the elbow joint. Which muscle is most likely impaired?

Accepted Answer

Triceps brachii

Question 3

Which of the following statements about the sliding filament model of muscle contraction is correct?

Accepted Answer

Thick and thin myofilaments slide past each other, shortening the sarcomere.

Question 4

Which type of muscle contraction is responsible for maintaining posture without producing movement?

Accepted Answer

Tonic contraction

Question 5

A person is performing a biceps curl. As the weight is lifted, the angle at the elbow decreases. What is this movement called?

Accepted Answer

Flexion

Question 6

Which of the following best describes the role of acetylcholine (ACh) at the neuromuscular junction?

Accepted Answer

It is released by the motor neuron and triggers muscle contraction.

Question 7

Which muscle is primarily responsible for plantar flexion of the foot, such as when standing on tiptoe?

Accepted Answer

Gastrocnemius

Question 8

A muscle that assists the prime mover in producing a movement is called a:

Accepted Answer

Synergist

Question 9

Which of the following is a characteristic feature of cardiac muscle tissue?

Accepted Answer

It contains intercalated disks.

Question 10

During prolonged exercise, muscle cells may switch to anaerobic metabolism, resulting in the accumulation of which substance?

Accepted Answer

Lactic acid

Question 11

Which of the following best explains why rigor mortis occurs after death?

Accepted Answer

ATP is no longer available to release myosin-actin crossbridges.

Question 12

Which muscle group is responsible for extending the leg at the knee joint?

Accepted Answer

Quadriceps femoris

Question 13

A patient presents with muscle weakness that worsens with activity and improves with rest. Antibodies against acetylcholine receptors are found. What is the most likely diagnosis?

Accepted Answer

Myasthenia gravis

Question 14

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle develops tension but does not change length.

Question 15

Which of the following is a result of endurance (aerobic) training on skeletal muscle?

Accepted Answer

Improved delivery of oxygen and nutrients to muscle

Question 16

Which movement describes turning the sole of the foot inward toward the midline?

Accepted Answer

Inversion

Question 17

Which of the following best describes the effect of strength training on skeletal muscle?

Accepted Answer

It increases the number of myofilaments in each muscle fiber.

Question 18

Which muscle is primarily responsible for flexing the thigh at the hip joint and stabilizing posture?

Accepted Answer

Iliopsoas

Question 19

Which of the following is a function of the bursae in relation to muscle movement?

Accepted Answer

They reduce friction between tendons and bones.

Question 20

A muscle injury resulting from overexertion that involves stretching or tearing of muscle fibers is called:

Accepted Answer

Strain

The Muscular System: Structure, Function, and Disorders

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