Question 1

Which of the following is NOT a major function of muscle tissue?

Accepted Answer

Store and release calcium

Question 2

Which connective tissue layer surrounds an individual skeletal muscle fiber?

Accepted Answer

Endomysium

Question 3

During muscle contraction, which sarcomere region shortens the most?

Accepted Answer

I-band

Question 4

Which muscle tissue type is found in the walls of hollow visceral organs, such as the stomach?

Accepted Answer

Smooth muscle

Question 5

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

Accepted Answer

Storing and releasing $$\mathrm{Ca$$^{2+}$$}$$

Question 6

Which protein forms the elastic filament that helps the sarcomere recoil after stretching?

Accepted Answer

Titin

Question 7

A triad in skeletal muscle consists of:

Accepted Answer

One T tubule and two terminal cisterns

Question 8

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

Accepted Answer

Thick filaments are anchored to the M-line, thin filaments to the Z-disc

Question 9

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

Accepted Answer

Elasticity

Question 10

If a muscle fiber is stimulated and contracts, which of the following changes occur in the sarcomere?

Accepted Answer

The I-band shortens

Question 11

Which structure increases the surface area of the muscle fiber and allows electrical impulses to penetrate deep into the cell?

Accepted Answer

T tubules

Question 12

Which of the following is TRUE regarding cardiac muscle?

Accepted Answer

It has branching chains of cells with intercalated discs

Question 13

Which protein links thin filaments to proteins of the sarcolemma?

Accepted Answer

Dystrophin

Question 14

Which of the following is a correct sequence of organizational levels in skeletal muscle, from largest to smallest?

Accepted Answer

Muscle, fascicle, muscle fiber

Question 15

Which of the following statements about the sliding filament model is correct?

Accepted Answer

Myosin heads bind to actin and pull thin filaments toward the M-line

Question 16

Which of the following is a function of the perimysium?

Accepted Answer

Surrounds groups of muscle fibers (fascicles)

Question 17

Which regulatory protein blocks the myosin-binding sites on actin in a relaxed muscle?

Accepted Answer

Tropomyosin

Question 18

A patient with a genetic defect in dystrophin is most likely to experience which of the following?

Accepted Answer

Muscle weakness due to disrupted linkage between thin filaments and sarcolemma

Question 19

Which of the following best describes the function of the terminal cisterns in skeletal muscle?

Accepted Answer

They store and release $$\mathrm{Ca$$^{2+}$$}$$ during muscle contraction

Question 20

Which of the following is TRUE regarding the length of the A-band during muscle contraction?

Accepted Answer

The A-band remains the same length

Muscles and Muscle Tissue: Structure, Function, and Organization

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