Question 1

Which of the following best describes the primary function of skeletal muscle tissue in the human body?

Accepted Answer

To move the skeleton and maintain posture

Question 2

A muscle fiber is surrounded by which of the following connective tissue layers?

Accepted Answer

Endomysium

Question 3

Which structure allows electrical signals to penetrate deep into a muscle fiber, ensuring all myofibrils are stimulated simultaneously?

Accepted Answer

T tubules

Question 4

During muscle contraction, which ion is released from the sarcoplasmic reticulum and binds to troponin?

Accepted Answer

$$Ca^{2+}$$

Question 5

What is the role of tropomyosin in muscle contraction?

Accepted Answer

It covers myosin binding sites on actin at rest

Question 6

Which of the following best describes the 'sliding filament model' of muscle contraction?

Accepted Answer

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

Question 7

A motor unit consists of:

Accepted Answer

A motor neuron and all the muscle fibers it controls

Question 8

Which phase of a muscle twitch corresponds to the time when $$Ca^{2+} is $$being released from the sarcoplasmic reticulum, but no tension is produced yet?

Accepted Answer

Latent period

Question 9

If a muscle is generating tension but does not change length, what type of contraction is occurring?

Accepted Answer

Isometric contraction

Question 10

Which of the following best explains why temporal summation leads to stronger muscle contractions?

Accepted Answer

$$Ca^{2+}$$ builds up in the muscle cell, allowing more cross-bridges to form

Question 11

What is the minimum stimulus required to recruit any motor units in a muscle called?

Accepted Answer

Threshold stimulus

Question 12

Which of the following is true regarding the arrangement of myofilaments in a sarcomere?

Accepted Answer

The H band contains only myosin

Question 13

During the cross-bridge cycle, what causes the myosin head to detach from actin?

Accepted Answer

Binding of new ATP to the myosin head

Question 14

Which of the following best describes the function of the sarcolemma?

Accepted Answer

It is the specialized cell membrane that conducts electrical signals

Question 15

A patient is unable to maintain posture while sitting upright at a desk. Which muscle function is most likely impaired?

Accepted Answer

Maintenance of muscle tone

Question 16

Which of the following is a correct sequence of structures from largest to smallest in skeletal muscle?

Accepted Answer

Muscle → Fascicle → Muscle fiber → Myofibril

Question 17

Which of the following best explains why large, powerful muscles have many muscle fibers per motor unit?

Accepted Answer

To generate greater force during contraction

Question 18

Which event marks the beginning of the contraction phase in a muscle twitch?

Accepted Answer

Cross-bridges between actin and myosin are fully activated

Question 19

A muscle is stimulated so rapidly that no evidence of relaxation is seen and the contractions fuse into a smooth, sustained contraction. This is called:

Accepted Answer

Complete tetanus

Question 20

Which of the following best describes the role of ATP in the cross-bridge cycle?

Accepted Answer

ATP hydrolysis cocks the myosin head for the next power stroke

Muscles and Muscle Tissue: Structure, Function, and Physiology

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