Q: Which equation best represents the energy usage during muscle contraction by myosin heads?

$$ATP \rightarrow ADP + P_i + \text{energy}$$

Question 1

Which property of muscular tissue allows it to respond to a stimulus, similar to nervous tissue?

Accepted Answer

Excitability

Question 2

A patient suffers a deep laceration to the thigh, severing the connective tissue that surrounds the entire muscle. Which layer is most likely damaged?

Accepted Answer

Epimysium

Question 3

Which type of muscle tissue is characterized by striated, branched fibers and is found only in the heart?

Accepted Answer

Cardiac muscle

Question 4

During muscle contraction, which filament does myosin pull toward the center of the sarcomere?

Accepted Answer

Actin

Question 5

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 6

A muscle is unable to return to its original shape after being stretched. Which property is most likely impaired?

Accepted Answer

Elasticity

Question 7

Which structure marks the boundary of a sarcomere and anchors the thin filaments?

Accepted Answer

Z disc

Question 8

Which muscle tissue type is involuntary, non-striated, and found in the walls of internal organs?

Accepted Answer

Smooth muscle

Question 9

What is the correct order of organization from largest to smallest in muscle tissue?

Accepted Answer

Muscle, fascicle, muscle fiber, myofibril, sarcomere, filament

Question 10

Which of the following is a function of superficial fascia?

Accepted Answer

Provides insulation and padding

Question 11

A muscle group is unable to move freely due to a thickened connective tissue that restricts movement. Which structure is most likely involved?

Accepted Answer

Deep fascia

Question 12

Which protein forms the thick filament in a sarcomere and uses ATP to generate force?

Accepted Answer

Myosin

Question 13

Which of the following best describes the role of intercalated discs in cardiac muscle?

Accepted Answer

They allow coordinated contraction via gap junctions and desmosomes

Question 14

If a muscle cannot be stretched beyond its normal length, which property is most likely deficient?

Accepted Answer

Extensibility

Question 15

Which band in the sarcomere contains only thin (actin) filaments and the Z-discs?

Accepted Answer

I band

Question 16

A patient with a genetic defect in gap junctions of cardiac muscle would most likely experience which symptom?

Accepted Answer

Uncoordinated heart contractions

Question 17

Which structure is a bundle of muscle fibers wrapped in perimysium?

Accepted Answer

Fascicle

Question 18

Which of the following is TRUE regarding the arrangement of skeletal muscles?

Accepted Answer

They are often arranged in opposing pairs, where one contracts and the other relaxes

Question 19

Which connective tissue structure is a thick sheet that connects two muscle bellies, such as the occipitofrontalis?

Accepted Answer

Aponeurosis

Question 20

Which equation best represents the energy usage during muscle contraction by myosin heads?

Accepted Answer

$$ATP ightarrow ADP + P_i + 	ext{energy}$$

Muscular Tissue: Structure, Function, and Organization

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