Q: During intense exercise, muscle fibers rely on anaerobic glycolysis for energy. Which equation best represents the net ATP yield from glycolysis?

$$\text{Glucose} + 2\text{ADP} + 2\text{P}_i \rightarrow 2\text{Pyruvate} + 2\text{ATP} + 2\text{H}_2\text{O}$$

Question 1

Which of the following best describes the primary function of skeletal muscle tissue?

Accepted Answer

To produce voluntary movements by contracting and pulling on bones

Question 2

A muscle fiber is organized into bundles called fascicles. Which connective tissue layer surrounds each fascicle?

Accepted Answer

Perimysium

Question 3

Which structure within the sarcomere is responsible for anchoring the thin filaments and marks the boundary between adjacent sarcomeres?

Accepted Answer

Z line

Question 4

The thick filament in skeletal muscle is primarily composed of which protein, and what is its main function during contraction?

Accepted Answer

Myosin; forms cross-bridges with actin to generate force

Question 5

Excitable membranes are crucial for generating action potentials. Which property allows skeletal muscle fibers to respond to stimulation?

Accepted Answer

Ability to maintain a resting membrane potential and rapidly change it

Question 6

At the neuromuscular junction, which event directly triggers the release of acetylcholine from the motor neuron?

Accepted Answer

Arrival of an action potential at the axon terminal

Question 7

During muscle contraction, ATP is required for several steps. Which of the following best describes one role of ATP in the contraction cycle?

Accepted Answer

ATP hydrolysis provides energy for myosin head movement

Question 8

A patient is experiencing muscle weakness due to reduced neural stimulation. Which process is most directly affected?

Accepted Answer

Excitation-contraction coupling

Question 9

Peak tension in a muscle fiber is determined by the number of cross-bridges formed. Which factor most directly influences this number?

Accepted Answer

The length of the sarcomere at the start of contraction

Question 10

A muscle’s peak tension during contraction depends on the recruitment of motor units. Which statement best explains the significance of motor unit recruitment?

Accepted Answer

Recruiting more motor units increases the strength of contraction

Question 11

Which type of muscle contraction occurs when the muscle length does not change, despite tension development?

Accepted Answer

Isometric contraction

Question 12

During intense exercise, muscle fibers rely on anaerobic glycolysis for energy. Which equation best represents the net ATP yield from glycolysis?

Accepted Answer

$$	ext{Glucose} + 2	ext{ADP} + 2	ext{P}_i ightarrow 2	ext{Pyruvate} + 2	ext{ATP} + 2	ext{H}_2	ext{O}$$

Question 13

Muscle fatigue can result from several factors. Which scenario best illustrates muscle fatigue due to lactic acid accumulation?

Accepted Answer

A sprinter experiences burning sensation in the legs after a 400-meter dash

Question 14

After intense exercise, muscle recovery involves the removal of lactic acid. Which process is primarily responsible for converting lactic acid back to glucose?

Accepted Answer

The Cori cycle in the liver

Question 15

Which muscle fiber type is best suited for endurance activities, and why?

Accepted Answer

Slow oxidative fibers; they have high mitochondrial density and resist fatigue

Question 16

A bodybuilder experiences muscle hypertrophy after months of resistance training. Which physiological factor is most responsible for this change?

Accepted Answer

Increased size of individual muscle fibers due to more myofibrils

Question 17

A patient with nerve damage to a muscle group is likely to experience which condition?

Accepted Answer

Muscle atrophy

Question 18

Which of the following best describes the relationship between excitation-contraction coupling and calcium ions?

Accepted Answer

Calcium ions bind to troponin, exposing active sites on actin

Question 19

A muscle fiber is stimulated at a frequency that does not allow complete relaxation between stimuli. Which phenomenon is most likely occurring?

Accepted Answer

Incomplete tetanus

Question 20

A patient is diagnosed with paralysis of a muscle group. Which of the following best explains the physiological basis for paralysis?

Accepted Answer

Loss of neural input prevents action potentials and muscle contraction

Skeletal Muscle Tissue: Structure, Function, and Physiology

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