Question 1

Which property of muscle tissue allows it to return to its original length after being stretched or contracted?

Accepted Answer

Elasticity

Question 2

A patient is experiencing muscle fatigue after prolonged exercise. Which of the following is NOT a major contributor to muscle fatigue?

Accepted Answer

Excessive oxygen supply to the muscle

Question 3

Which connective tissue component surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

During the contraction cycle, what is the role of calcium ions ($$\mathrm{Ca$$^{2+}$$}$$)?

Accepted Answer

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

Question 5

Which protein is responsible for linking the thin filaments to the sarcolemma and is associated with muscular dystrophy?

Accepted Answer

Dystrophin

Question 6

A sprinter relies on rapid, powerful muscle contractions. Which type of skeletal muscle fiber is most abundant in their leg muscles?

Accepted Answer

Fast glycolytic fibers

Question 7

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

Accepted Answer

Stores and releases calcium ions ($$\mathrm{Ca$$^{2+}$$}) to $$trigger contraction

Question 8

Which equation correctly represents the synthesis of creatine phosphate in muscle metabolism?

Accepted Answer

$$\mathrm{Creatine} + \mathrm{ATP} \rightarrow \mathrm{Creatine\ Phosphate} + \mathrm{ADP}$$

Question 9

Which muscle protein directly blocks the myosin binding sites on actin in a relaxed muscle?

Accepted Answer

Tropomyosin

Question 10

A patient with a genetic mutation affecting titin would most likely have problems with which muscle property?

Accepted Answer

Elasticity

Question 11

Which of the following is TRUE regarding cardiac muscle tissue?

Accepted Answer

It is found only in the heart wall and contracts involuntarily.

Question 12

Which process provides the majority of ATP for muscle activity lasting longer than 1 minute?

Accepted Answer

Aerobic respiration

Question 13

During the sliding filament mechanism, which bands of the sarcomere change length as contraction occurs?

Accepted Answer

I band shortens

Question 14

Which of the following best explains why red muscle fibers are more resistant to fatigue than white muscle fibers?

Accepted Answer

Red fibers have more myoglobin and mitochondria, allowing for greater aerobic ATP production.

Question 15

A muscle fiber is stimulated repeatedly before it has completely relaxed. What phenomenon does this describe?

Accepted Answer

Wave summation

Question 16

Which of the following is the correct sequence of events in excitation-contraction coupling?

Accepted Answer

Release of acetylcholine → depolarization of sarcolemma → release of $$\mathrm{Ca$$^{2+}$$}$$ from SR → binding of $$\mathrm{Ca$$^{2+}$$} to $$troponin

Question 17

Which of the following is a function of muscular tissue that is essential for maintaining body temperature?

Accepted Answer

Generating heat

Question 18

Which structural protein helps maintain the alignment of the thin filaments in the sarcomere?

Accepted Answer

Nebulin

Question 19

A muscle cell is unable to produce enough ATP through aerobic respiration due to low oxygen supply. Which metabolic pathway will be primarily used to generate ATP?

Accepted Answer

Anaerobic respiration (glycolysis)

Question 20

Which of the following statements about motor units is correct?

Accepted Answer

The size of a motor unit determines the strength of contraction.

Chapter 10: The Muscle Tissue – Structure, Function, and Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard