Question 1

Which layer of connective tissue surrounds individual muscle fibers and contains satellite cells responsible for muscle repair?

Accepted Answer

Endomysium

Question 2

During muscle contraction, which band of the sarcomere remains the same length while the I band shortens?

Accepted Answer

A band

Question 3

What is the primary function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

Stores and releases calcium ions ($$Ca^{2+}) $$for muscle contraction

Question 4

Which protein complex prevents the formation of a cross bridge between actin and myosin in the absence of calcium?

Accepted Answer

Troponin-tropomyosin complex

Question 5

A patient with Duchene’s Muscular Dystrophy lacks which protein, resulting in muscle deterioration?

Accepted Answer

Dystrophin

Question 6

Which equation represents the direct phosphorylation of ADP to ATP in muscle cells?

Accepted Answer

$$ADP + Creatine\ Phosphate \xrightarrow{Creatine\ Kinase} ATP + Creatine$$

Question 7

Which type of muscle fiber is most resistant to fatigue and contains high levels of myoglobin?

Accepted Answer

Slow fibers (Type I)

Question 8

What is the physiological explanation for rigor mortis after death?

Accepted Answer

Sarcoplasmic reticulum releases $$Ca^{2+}$$, but no ATP is available to release the cross bridge

Question 9

Which process is described by the equation $$Glucose + O_2$ \rightarrow CO_2$ + H_2O + ATP$$ and is most efficient for prolonged muscle activity?

Accepted Answer

Aerobic Respiration

Question 10

In the neuromuscular junction, what is the role of acetylcholinesterase?

Accepted Answer

Deactivates acetylcholine to stop muscle stimulation

Question 11

Which type of muscle contraction occurs when muscle tension increases but the muscle length does not change?

Accepted Answer

Isometric contraction

Question 12

What is the main benefit of aerobic metabolism in muscle cells?

Accepted Answer

Efficient ATP production for prolonged activity

Question 13

Which clinical condition results from a toxin that prevents the release of acetylcholine at the neuromuscular junction?

Accepted Answer

Botulism

Question 14

During wave summation, what happens if a second stimulus arrives before the muscle has relaxed from the previous contraction?

Accepted Answer

The contraction becomes more powerful due to increased tension

Question 15

Which muscle fiber type is most abundant in muscles responsible for maintaining posture, such as the calf muscles?

Accepted Answer

Slow fibers

Question 16

What is the primary cause of muscle fatigue during intense exercise?

Accepted Answer

Accumulation of lactic acid and depletion of energy reserves

Question 17

Which structure marks the boundary between adjacent sarcomeres and anchors the thin filaments?

Accepted Answer

Z line

Question 18

What is the effect of increased muscle tone on resting metabolic rate?

Accepted Answer

Increases resting metabolic rate

Question 19

Which muscle tissue type is responsible for pushing blood through the circulatory system?

Accepted Answer

Cardiac muscle

Question 20

Which equation best represents anaerobic glycolysis in muscle cells?

Accepted Answer

$$Glucose \rightarrow 2\ Pyruvic\ Acid + 2\ ATP$$

Skeletal Muscle Tissue: Structure, Function, and Physiology

Study Guide - Practice Questions