Question 1

Which connective tissue layer surrounds individual muscle fibers within a skeletal muscle?

Accepted Answer

Endomysium

Question 2

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

It stores and releases $$\mathrm{Ca$$^{2+}$$}$$ ions to regulate muscle contraction.

Question 3

During the sliding filament model of muscle contraction, which event occurs?

Accepted Answer

Thin filaments slide past thick filaments, increasing their overlap.

Question 4

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

Accepted Answer

It consists of branching chains of cells with intercalated discs.

Question 5

A patient is diagnosed with Duchenne muscular dystrophy. Which protein is defective, leading to muscle fiber damage?

Accepted Answer

Dystrophin

Question 6

Which of the following best explains the 'all or none principle' in muscle physiology?

Accepted Answer

A muscle fiber contracts maximally if threshold is reached, or not at all if it is not.

Question 7

Which energy system provides ATP for the first 15 seconds of high-intensity exercise?

Accepted Answer

Direct phosphorylation of ADP by creatine phosphate

Question 8

What is the primary role of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

To degrade acetylcholine, terminating the signal at the synapse

Question 9

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle generates tension without changing length.

Question 10

Which of the following events occurs first during excitation-contraction coupling in skeletal muscle?

Accepted Answer

Arrival of an action potential at the axon terminal of the motor neuron

Question 11

Which of the following is true regarding the structure of a sarcomere?

Accepted Answer

The A band contains both thick and thin filaments.

Question 12

A muscle fiber is unable to relax after contraction. Which of the following is the most likely cause?

Accepted Answer

Insufficient ATP to detach myosin heads from actin

Question 13

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

Accepted Answer

It binds $$\mathrm{Ca$$^{2+}$$}$$ and moves tropomyosin away from actin's myosin-binding sites.

Question 14

Which of the following is a function of skeletal muscle tissue?

Accepted Answer

Generating heat as they contract

Question 15

During prolonged, low-intensity exercise, which pathway is the primary source of ATP?

Accepted Answer

Aerobic respiration

Question 16

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

Accepted Answer

ATP is no longer produced, so myosin heads cannot detach from actin.

Question 17

Which of the following is a distinguishing feature of smooth muscle tissue?

Accepted Answer

It is found in the walls of hollow organs and is non-striated.

Question 18

A patient with myasthenia gravis is likely to experience muscle weakness because:

Accepted Answer

Their immune system destroys acetylcholine receptors at the neuromuscular junction.

Question 19

Which of the following best describes the role of T tubules in skeletal muscle fibers?

Accepted Answer

They transmit action potentials deep into the muscle fiber.

Question 20

Which of the following statements about muscle contraction is correct?

Accepted Answer

Isometric contractions generate tension without changing muscle length.

Muscle Tissue: Structure, Function, and Physiology

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