Question 1

Which connective tissue sheath directly surrounds each individual muscle fiber in skeletal muscle?

Accepted Answer

Endomysium

Question 2

During a concentric contraction, which of the following changes occur in the sarcomere?

Accepted Answer

The H zone disappears

Question 3

Which of the following best describes the role of titin in the sarcomere?

Accepted Answer

It acts as a spring to resist overstretching and holds thick filaments in place

Question 4

A patient presents with muscle weakness and enlarged calf muscles due to fat and connective tissue infiltration. Which disorder is most likely?

Accepted Answer

Duchenne muscular dystrophy

Question 5

Which of the following muscle fiber types is most resistant to fatigue and why?

Accepted Answer

Slow oxidative fibers, because they have abundant mitochondria and myoglobin

Question 6

Which of the following is TRUE regarding the neuromuscular junction?

Accepted Answer

Acetylcholine is released from the terminal bouton to stimulate the muscle fiber

Question 7

Which of the following equations best represents the relationship between force and muscle fiber length for optimal contraction?

Accepted Answer

$$F = k(x - x_0$)$$,\ where\ F\ is\ force,\ x\ is\ fiber\ length,\ $$x_0$$\ is\ optimal\ length,\ and\ k\ is\ a\ constant$

Question 8

Which of the following best describes the difference between skeletal and cardiac muscle tissue?

Accepted Answer

Both are striated, but only cardiac muscle has intercalated discs

Question 9

Which of the following statements about the sliding filament mechanism is correct?

Accepted Answer

Myosin heads pull actin filaments toward the center of the sarcomere

Question 10

A muscle is stretched beyond its optimal length. Which protein helps prevent overstretching and what is its mechanism?

Accepted Answer

Titin, by unfolding and acting as a spring

Question 11

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

Accepted Answer

It surrounds each fascicle (bundle of muscle fibers)

Question 12

Which of the following is a characteristic of fast glycolytic muscle fibers?

Accepted Answer

Rapid contraction and quick fatigue

Question 13

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

Accepted Answer

Synthesis of hormones

Question 14

Which of the following best explains why muscle tone is important for joint stability?

Accepted Answer

Muscle tone helps stabilize synovial joints by maintaining slight contraction

Question 15

Which of the following best describes the difference in muscle mass between males and females?

Accepted Answer

Males have more muscle mass due to higher androgen levels

Question 16

Which of the following is the correct sequence of organizational levels in skeletal muscle from largest to smallest?

Accepted Answer

Muscle, fascicle, muscle fiber, myofibril, sarcomere

Question 17

Which of the following is TRUE regarding the source of calcium ions for contraction in skeletal muscle?

Accepted Answer

Calcium ions are released from the sarcoplasmic reticulum

Question 18

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

Accepted Answer

It is the plasma membrane of a muscle fiber

Question 19

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

Accepted Answer

It contracts involuntarily and has intercalated discs

Question 20

Which of the following best explains why eccentric contractions are important in daily activities?

Accepted Answer

They generate force as the muscle lengthens, acting as a brake to resist gravity

Skeletal Muscle Tissue: Structure, Function, and Comparison

스터디 가이드 - 연습 문제