Question 1

Which of the following is NOT a primary function of skeletal muscle tissue?

Accepted Answer

Producing hormones for metabolic regulation

Question 2

Which connective tissue layer surrounds individual muscle fibers and contains capillaries and nerve fibers?

Accepted Answer

Endomysium

Question 3

A muscle contraction that does NOT change the length of the muscle, but increases tension, is called:

Accepted Answer

Isometric contraction

Question 4

During the contraction cycle, which molecule binds to the myosin head to allow it to detach from actin?

Accepted Answer

ATP

Question 5

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

Accepted Answer

It stores and releases calcium ions required for contraction

Question 6

What is the correct sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Release of acetylcholine, binding to motor end plate, action potential in sarcolemma

Question 7

Which equation correctly represents the use of creatine phosphate to regenerate ATP during muscle contraction?

Accepted Answer

$$\mathrm{ADP} + \mathrm{creatine\ phosphate} \rightarrow \mathrm{ATP} + \mathrm{creatine}$$

Question 8

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

Accepted Answer

Slow-twitch fibers, because they have extensive capillary networks and high myoglobin

Question 9

A patient presents with muscle atrophy after wearing a cast for several weeks. Which statement best explains the physiological basis for this observation?

Accepted Answer

Muscle fibers become smaller and weaker due to reduced neural stimulation

Question 10

Which of the following statements about cardiac muscle tissue is TRUE?

Accepted Answer

Cardiac muscle cells contract automatically without neural stimulation

Question 11

Which process is responsible for the majority of ATP production during moderate, sustained muscle activity?

Accepted Answer

Aerobic metabolism in mitochondria

Question 12

Which of the following best describes the sliding filament theory?

Accepted Answer

Thin filaments slide toward the center of the sarcomere, while thick filaments remain stationary

Question 13

Which phase of a muscle twitch is characterized by the release of calcium ions and the formation of cross-bridges?

Accepted Answer

Contraction phase

Question 14

A muscle fiber is stimulated repeatedly before it has fully relaxed, resulting in a more powerful contraction. This phenomenon is called:

Accepted Answer

Summation

Question 15

Which of the following is a correct description of a motor unit?

Accepted Answer

A single motor neuron and all the muscle fibers it controls

Question 16

Which muscle action term describes a muscle that opposes the movement of the prime mover?

Accepted Answer

Antagonist

Question 17

Which muscle is the major abductor of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 18

Which muscle group is collectively known as the hamstrings?

Accepted Answer

Biceps femoris, semimembranosus, semitendinosus

Question 19

Which muscle is primarily responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 20

Which of the following changes is NOT typically associated with aging skeletal muscle?

Accepted Answer

Increase in muscle fiber diameter

The Muscular System: Structure and Function

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