Question 1

Which of the following best describes the function of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

It breaks down acetylcholine, terminating the signal at the synaptic cleft.

Question 2

During muscle contraction, which band shortens as the actin and myosin filaments slide past each other?

Accepted Answer

I Band

Question 3

A patient is experiencing muscle fatigue after intense exercise. Which metabolic pathway is primarily responsible for ATP production under these anaerobic conditions?

Accepted Answer

Glycolysis

Question 4

Which of the following is TRUE regarding the sarcolemma of a skeletal muscle cell?

Accepted Answer

It is the plasma membrane surrounding the muscle fiber.

Question 5

Which type of skeletal muscle fiber is most resistant to fatigue and why?

Accepted Answer

Type I fibers, because they have abundant mitochondria and myoglobin.

Question 6

If acetylcholinesterase is absent from the synaptic cleft, what would most likely happen to muscle contraction?

Accepted Answer

Muscle contraction would be prolonged due to continued stimulation.

Question 7

Which equation correctly represents the net ATP yield from glycolysis under anaerobic conditions?

Accepted Answer

$$2 	ext{ ATP}$$

Question 8

A muscle is stimulated to contract but does not change length. What type of contraction is this?

Accepted Answer

Isometric contraction

Question 9

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

Intercalated discs for synchronized contraction

Question 10

Which structure in the muscle fiber stores calcium ions necessary for contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 11

Which of the following best explains muscle hypertrophy?

Accepted Answer

Increase in the size of existing muscle fibers due to repeated stimulation

Question 12

During the contraction cycle, which molecule binds to myosin to provide energy for the power stroke?

Accepted Answer

ATP

Question 13

Which of the following is NOT a component of the motor unit?

Accepted Answer

Sarcoplasmic reticulum

Question 14

Which process is responsible for the breakdown of stored glucose to provide ATP during intense exercise?

Accepted Answer

Glycolysis

Question 15

Which of the following best describes the sliding filament theory?

Accepted Answer

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

Question 16

Which equation represents the conversion of glucose to pyruvate during glycolysis?

Accepted Answer

$$C_6H_{12}O_6$ \rightarrow 2C_3H_4O_3 + 2ATP$$

Question 17

Which of the following is a consequence of muscle atrophy?

Accepted Answer

Decrease in muscle mass and strength

Question 18

Which neurotransmitter is released at the neuromuscular junction to initiate muscle contraction?

Accepted Answer

Acetylcholine

Question 19

Which of the following is TRUE about isotonic contractions?

Accepted Answer

Muscle changes length while tension remains relatively constant.

Question 20

Which of the following best describes rigor mortis?

Accepted Answer

Muscle stiffness after death due to lack of ATP for detachment of myosin from actin

Study Guide: Muscle Tissue and Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard