Q: Which equation correctly represents the breakdown of ATP during muscle contraction?

$$ATP \rightarrow ADP + P_i + \text{energy}$$

Question 1

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions ($$Ca^{2+}) $$necessary for muscle contraction.

Question 2

A patient presents with muscle weakness. Laboratory tests reveal a deficiency in acetylcholine (ACh) release at the neuromuscular junction. Which step in the excitation-contraction coupling is most directly affected?

Accepted Answer

Depolarization of the motor end plate.

Question 3

Which equation correctly represents the breakdown of ATP during muscle contraction?

Accepted Answer

$$ATP ightarrow ADP + P_i + 	ext{energy}$$

Question 4

Which of the following best explains why cardiac muscle cells are resistant to fatigue compared to skeletal muscle cells?

Accepted Answer

Cardiac muscle cells have more mitochondria and a greater blood supply.

Question 5

During a sustained muscle contraction, which process is primarily responsible for the continued supply of ATP?

Accepted Answer

Aerobic cellular respiration.

Question 6

A muscle fiber is stimulated repeatedly at a high frequency, resulting in a smooth, sustained contraction. What is this phenomenon called?

Accepted Answer

Tetanus.

Question 7

Which of the following is NOT a characteristic of smooth muscle tissue?

Accepted Answer

Presence of striations.

Question 8

Which structure connects muscle to bone and is composed primarily of dense regular connective tissue?

Accepted Answer

Tendon.

Question 9

Which of the following best describes the sliding filament theory of muscle contraction?

Accepted Answer

Actin and myosin filaments slide past each other, shortening the sarcomere.

Question 10

A sprinter relies on fast-twitch muscle fibers during a race. Which property is most characteristic of these fibers?

Accepted Answer

High rate of ATP hydrolysis and rapid fatigue.

Question 11

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

Accepted Answer

It rapidly donates a phosphate group to ADP to regenerate ATP.

Question 12

Which event occurs first during excitation-contraction coupling in skeletal muscle?

Accepted Answer

Release of acetylcholine from the motor neuron.

Question 13

Which of the following is a function of the T-tubules in skeletal muscle fibers?

Accepted Answer

Transmit action potentials deep into the muscle fiber.

Question 14

A muscle is stimulated with increasing frequency, and the contractions begin to overlap, resulting in greater force. What is this process called?

Accepted Answer

Summation.

Question 15

Which of the following best describes the role of troponin in muscle contraction?

Accepted Answer

It binds calcium ions, causing tropomyosin to move and expose binding sites on actin.

Question 16

Which of the following equations represents the relationship between force ($$F$$), mass ($$m$$), and acceleration ($$a) in $$muscle contraction?

Accepted Answer

$$F = m 	imes a$$

Question 17

Which of the following is a major difference between skeletal muscle and cardiac muscle?

Accepted Answer

Cardiac muscle cells are connected by intercalated discs, while skeletal muscle cells are not.

Question 18

Which of the following best describes the function of myosin ATPase during muscle contraction?

Accepted Answer

It hydrolyzes ATP to provide energy for the power stroke.

Question 19

A patient is unable to relax their muscles after contraction. Which protein is most likely malfunctioning?

Accepted Answer

Tropomyosin.

Question 20

Which of the following best explains the importance of blood vessels in muscle tissue?

Accepted Answer

They deliver oxygen and nutrients and remove waste products.

Skeletal Muscle Structure and Function: Study Guide

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