Q: Which equation correctly represents the aerobic pathway for ATP production in muscle cells?

$$\text{Glucose} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + 38\ \text{ATP} + \text{heat}$$

Question 1

Which of the following best explains why skeletal muscle fibers appear striated under a microscope?

Accepted Answer

The arrangement of thick and thin myofilaments into sarcomeres, creating alternating dark (A) and light (I) bands.

Question 2

A patient suffers from muscle weakness and is diagnosed with a disorder affecting the sarcolemma's ability to conduct action potentials. Which process would be directly impaired?

Accepted Answer

Release of calcium from the sarcoplasmic reticulum.

Question 3

During a muscle contraction, which event occurs immediately after calcium ions bind to troponin?

Accepted Answer

Tropomyosin shifts, exposing myosin-binding sites on actin.

Question 4

Which equation correctly represents the aerobic pathway for ATP production in muscle cells?

Accepted Answer

$$	ext{Glucose} + 	ext{O}_2 ightarrow 	ext{CO}_2 + 	ext{H}_2	ext{O} + 38\ 	ext{ATP} + 	ext{heat}$$

Question 5

A marathon runner's muscles are primarily composed of which type of muscle fiber, and what is a key characteristic of these fibers?

Accepted Answer

Slow oxidative fibers; high myoglobin content and resistance to fatigue

Question 6

Which of the following best describes the role of ATP in muscle contraction and relaxation?

Accepted Answer

ATP is needed for detaching the myosin head from actin and for pumping calcium back into the sarcoplasmic reticulum.

Question 7

A person is holding a heavy box without moving it. Which type of muscle contraction is primarily occurring in their biceps brachii?

Accepted Answer

Isometric contraction

Question 8

Which of the following statements about cardiac muscle is TRUE?

Accepted Answer

Cardiac muscle contraction can occur without motor neuron stimulation due to self-excitation.

Question 9

Which process is responsible for the initial rapid supply of ATP during the first few seconds of intense muscle activity?

Accepted Answer

Phosphate transfer from creatine phosphate to ADP

Question 10

A patient with damage to their lower motor neurons exhibits flaccid paralysis. Which term best describes their muscle tone?

Accepted Answer

Hypotonic

Question 11

Which of the following best explains why smooth muscle can maintain contraction for extended periods without fatigue?

Accepted Answer

Smooth muscle uses the latchbridge mechanism, allowing myosin to remain attached to actin without using extra ATP.

Question 12

Which of the following is a correct sequence of events in the sliding filament theory of muscle contraction?

Accepted Answer

Action potential travels down sarcolemma, calcium is released, calcium binds to troponin, tropomyosin shifts, myosin binds to actin.

Question 13

Which of the following best describes the difference between a small and a large motor unit?

Accepted Answer

Small motor units control precise movements and have few muscle fibers per neuron.

Question 14

Which of the following is TRUE regarding the refractory period in skeletal muscle?

Accepted Answer

It is the time during which the muscle cannot be stimulated again, ensuring proper relaxation before the next contraction.

Question 15

Which of the following best explains why cardiac muscle cannot undergo tetanus?

Accepted Answer

Cardiac muscle has a long refractory period, preventing summation of contractions.

Question 16

A sprinter relies on which metabolic pathway for ATP production during a 10-second race, and what is the net ATP yield per glucose molecule?

Accepted Answer

Anaerobic glycolysis; 2 ATP

Question 17

Which of the following is a function of the perimysium in skeletal muscle?

Accepted Answer

Surrounds each fascicle and contains blood vessels and nerves.

Question 18

Which of the following best describes the process of muscle hypertrophy?

Accepted Answer

Enlargement of muscle cells due to an increase in myofibrils.

Question 19

Which of the following statements about smooth muscle contraction is correct?

Accepted Answer

Calcium binds to calmodulin, initiating contraction.

Muscle Tissue: Structure, Function, and Physiology

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