Question 1

Which of the following best describes the property of extensibility in muscle tissue?

Accepted Answer

The ability to stretch without damage

Question 2

A patient is experiencing muscle paralysis after receiving a cosmetic injection. Which of the following best explains the mechanism of action of botulinum toxin (Botox) in this scenario?

Accepted Answer

It prevents the release of acetylcholine from the motor neuron

Question 3

During muscle contraction, which of the following structures does NOT change in length?

Accepted Answer

A band

Question 4

Which of the following is the correct sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Action potential arrives at axon terminal → Voltage-gated Ca$$^{2+}$$ channels open → Ca$$^{2+}$$ enters axon terminal → Acetylcholine is released

Question 5

Which of the following best defines a motor unit?

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 6

Which of the following statements about slow oxidative muscle fibers is TRUE?

Accepted Answer

They are best for endurance activities like marathon running

Question 7

A muscle fiber is unable to contract even though it is still receiving neural stimulation. Which of the following is the most likely cause?

Accepted Answer

Muscle fatigue due to decreased ATP and ionic imbalance

Question 8

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

Accepted Answer

It is the basic contractile unit of muscle

Question 9

Which of the following changes would you expect in skeletal muscle after regular aerobic exercise?

Accepted Answer

Increase in the number of mitochondria and capillaries

Question 10

Which of the following best explains why fast glycolytic fibers are suited for sprinting?

Accepted Answer

They contract quickly and generate high force using anaerobic ATP synthesis

Question 11

Which of the following is a correct statement about the sliding filament theory?

Accepted Answer

Myosin heads pull the actin filaments toward the center of the sarcomere

Question 12

Which of the following is a unique feature of cardiac muscle compared to skeletal muscle?

Accepted Answer

Cardiac muscle cells are branched and connected by intercalated discs

Question 13

Which of the following best describes the role of calcium ions ($$Ca^{2+}) in $$muscle contraction?

Accepted Answer

They bind to troponin, causing tropomyosin to move and expose binding sites on actin

Question 14

Which of the following is a characteristic of smooth muscle but NOT skeletal muscle?

Accepted Answer

Spindle-shaped cells

Question 15

A muscle is repeatedly stimulated at a high frequency, resulting in a sustained contraction without relaxation. What is this phenomenon called?

Accepted Answer

Tetanus

Question 16

Which of the following best describes the function of myoglobin in muscle fibers?

Accepted Answer

It binds oxygen for use during aerobic metabolism

Question 17

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

Accepted Answer

Endomysium → Perimysium → Epimysium

Question 18

Which of the following best describes the process of cross-bridge formation during muscle contraction?

Accepted Answer

Myosin heads bind to actin after tropomyosin moves, forming cross-bridges

Question 19

Which of the following best explains the concept of post-exercise oxygen consumption (EPOC)?

Accepted Answer

The increased oxygen intake after exercise to restore metabolic conditions in muscle

Question 20

Which of the following is a result of regular resistance exercise on skeletal muscle?

Accepted Answer

Increase in muscle fiber hypertrophy and strength

Muscle Tissue Structure and Function: Study Notes for Anatomy & Physiology

Study Guide - Practice Questions

Study Guide - Flashcards