Question 1

Which of the following best describes the function of the perimysium in skeletal muscle tissue?

Accepted Answer

It divides the muscle into fascicles and contains blood vessels and nerves.

Question 2

A patient is unable to relax their muscles after contraction, resulting in muscle rigidity. Which of the following is the most likely explanation for this condition?

Accepted Answer

There is a lack of ATP available to detach myosin heads from actin.

Question 3

Which of the following correctly matches the muscle tissue type with its characteristic as seen in the first image (a, b, c from top to bottom)?

Accepted Answer

a: skeletal muscle, b: smooth muscle, c: cardiac muscle

Question 4

During intense exercise, when oxygen is limited, which metabolic pathway provides ATP for muscle contraction and what is the byproduct?

Accepted Answer

Glycolysis; lactic acid

Question 5

Which structure in the muscle fiber is responsible for storing and releasing calcium ions during muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 6

What is the role of acetylcholinesterase (AChE) at the neuromuscular junction?

Accepted Answer

It degrades acetylcholine in the synaptic cleft, terminating the signal for muscle contraction.

Question 7

Which of the following equations correctly represents the ATP production from one glucose molecule during aerobic respiration?

Accepted Answer

$$2 	imes 17 = 34$$

Question 8

A muscle fiber is unable to contract even though acetylcholine is present at the neuromuscular junction. Which of the following is the most likely cause?

Accepted Answer

The sarcoplasmic reticulum is unable to release calcium ions.

Question 9

Which protein complex covers the active sites on actin molecules in a resting muscle fiber?

Accepted Answer

Troponin-tropomyosin complex

Question 10

Which of the following best explains why skeletal muscle fibers are multinucleate?

Accepted Answer

They need multiple copies of genes to produce the proteins required for contraction.

Question 11

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

Accepted Answer

Action potential in sarcolemma → release of Ca$$^{2+}$$ from SR → binding of Ca$$^{2+} to $$troponin → movement of tropomyosin → cross-bridge formation

Question 12

Which of the following statements about the sliding filament model of muscle contraction is correct?

Accepted Answer

Thin filaments slide past thick filaments, shortening the sarcomere.

Question 13

If a toxin blocks the reuptake of calcium ions into the sarcoplasmic reticulum, what would be the most likely effect on muscle contraction?

Accepted Answer

Muscle contraction would be prolonged due to continued cross-bridge cycling.

Question 14

Which of the following best describes the role of creatine phosphate in muscle contraction?

Accepted Answer

It donates a phosphate group to ADP to rapidly regenerate ATP during the first few seconds of contraction.

Question 15

Which of the following is a function unique to skeletal muscle tissue compared to cardiac and smooth muscle?

Accepted Answer

Voluntary control over swallowing, defecation, and urination

Question 16

A muscle fiber is observed to have striations, multiple peripheral nuclei, and voluntary control. Which type of muscle tissue is this?

Accepted Answer

Skeletal muscle

Question 17

Which of the following best explains why glycolysis is important during intense exercise?

Accepted Answer

It allows ATP production to continue when oxygen is limited.

Question 18

Which of the following is the correct formula for the breakdown of one glucose molecule during glycolysis?

Accepted Answer

$$	ext{Glucose} ightarrow 2\ 	ext{ATP} + 2\ 	ext{Pyruvate}$$

Question 19

Which of the following best describes the role of satellite cells in skeletal muscle?

Accepted Answer

They are stem cells involved in muscle tissue repair.

Muscle Tissue: Structure, Function, and Contraction Mechanisms

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드