Question 1

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

Accepted Answer

Generating voluntary movements by pulling on bones across joints.

Question 2

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 3

A patient presents with muscle weakness and abnormal heart rhythms. Genetic testing reveals a mutation affecting muscle contraction. Which muscle disorder is most likely?

Accepted Answer

Myotonic dystrophy

Question 4

Which of the following statements about sarcomeres is correct?

Accepted Answer

Sarcomeres are the functional contractile units of skeletal muscle.

Question 5

During a concentric contraction, what happens to the sarcomere length?

Accepted Answer

The sarcomere shortens as the muscle generates force.

Question 6

Which muscle fiber type is most abundant in postural muscles such as those in the back and calf?

Accepted Answer

Slow oxidative (SO)

Question 7

What is the primary role of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

Storing and releasing calcium ions to trigger contraction.

Question 8

Which of the following best explains why tendons are difficult to break?

Accepted Answer

They are made of mineralized collagen fibers forming a strong, permanent bond with bone.

Question 9

A muscle is stretched beyond its optimal resting length. What is the expected effect on its ability to generate force?

Accepted Answer

Force generation decreases due to reduced filament overlap.

Question 10

Which of the following is true regarding the innervation of skeletal muscle fibers?

Accepted Answer

Each muscle fiber is innervated by a single motor neuron.

Question 11

Which property of muscle tissue allows it to return to its original length after being stretched?

Accepted Answer

Elasticity

Question 12

A 35-year-old individual notices a gradual decrease in muscle mass and endurance. Which physiological process best explains this change?

Accepted Answer

Replacement of muscle tissue with adipose or fibrous connective tissue.

Question 13

Which of the following best describes the arrangement of myofilaments within a sarcomere?

Accepted Answer

Actin filaments extend from the Z disc toward the center, and myosin is connected to the Z disc by titin.

Question 14

Which muscle tissue type is characterized by being striated and involuntary?

Accepted Answer

Cardiac muscle

Question 15

Which of the following is a function of sphincter muscles?

Accepted Answer

Encircling and closing off body passageways.

Question 16

Which of the following best describes the difference between fast glycolytic (FG) and slow oxidative (SO) muscle fibers?

Accepted Answer

SO fibers use aerobic metabolism and are more fatigue-resistant than FG fibers.

Question 17

Which of the following equations best represents the relationship between force generation and sarcomere length?

Accepted Answer

$$F = F_{max} at$$ $$L = L_{opt}$$, and $$F$$ decreases as $$|L - L_{opt}|$$ increases

Question 18

Which of the following best explains why top distance runners have a higher proportion of SO fibers compared to sprinters?

Accepted Answer

SO fibers are genetically determined and provide greater endurance.

Question 19

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

Accepted Answer

Propelling food through the digestive tract

Question 20

Which of the following best describes the role of titin in the sarcomere?

Accepted Answer

Titin connects myosin to the Z disc and contributes to muscle elasticity.

Muscle Tissue and Organization: Study Notes for Anatomy & Physiology

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