Question 1

Which of the following is NOT a basic property shared by all muscle tissues?

Accepted Answer

Plasticity

Question 2

A patient suffers a traumatic injury that severs the tendon connecting the biceps brachii to the radius. Which function of skeletal muscle will be most directly impaired?

Accepted Answer

Production of skeletal movement

Question 3

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

During muscle contraction, which event occurs within the sarcomere according to the sliding filament theory?

Accepted Answer

The H band and I band get smaller

Question 5

Which protein covers the binding sites on actin when the muscle is relaxed?

Accepted Answer

Tropomyosin

Question 6

A motor neuron controlling only two or three muscle fibers is most likely found in which muscle group?

Accepted Answer

Eye muscles

Question 7

Which of the following best describes a bipennate muscle fiber arrangement?

Accepted Answer

Muscle fibers are on both sides of the tendon

Question 8

Which event directly triggers the release of calcium ions from the sarcoplasmic reticulum during muscle contraction?

Accepted Answer

Arrival of an impulse at the motor end plate

Question 9

What is the main function of myofibrils within a muscle fiber?

Accepted Answer

Contract the muscle fiber

Question 10

Which of the following equations correctly represents the relationship between force, lever arm length, and torque in muscle movement?

Accepted Answer

$T = F 	imes r$

Question 11

A muscle fiber is described as 'multinucleated.' What does this mean in terms of cellular structure?

Accepted Answer

It contains hundreds of nuclei

Question 12

Which type of muscle fiber arrangement allows for the greatest range of motion but the least force production?

Accepted Answer

Parallel

Question 13

Which of the following is a correct sequence of events leading to muscle contraction?

Accepted Answer

Impulse travels down axon → Acetylcholine released → Sarcoplasmic reticulum releases calcium → Calcium binds to troponin

Question 14

Which structure is responsible for the chemical communication between a nerve and a muscle?

Accepted Answer

Neuromuscular junction

Question 15

If a muscle contains fascicles arranged in concentric rings, what is this organization called?

Accepted Answer

Circular

Question 16

Which of the following changes occurs in aging skeletal muscle fibers?

Accepted Answer

Decrease in glycogen reserves

Question 17

Which of the following is true regarding the arrangement of myofilaments in a sarcomere?

Accepted Answer

Actin and myosin are arranged in repeating units called sarcomeres

Question 18

Which muscle fiber arrangement is best suited for generating the greatest force?

Accepted Answer

Multipennate

Question 19

Which of the following statements about the A band in a sarcomere is correct?

Accepted Answer

The width of the A band remains constant during contraction

Question 20

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

Accepted Answer

ATP is required for the detachment of myosin heads from actin

The Muscular System: Skeletal Muscle Tissue and Organization

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