Question 1

Which of the following best describes the primary function of muscle tissue in the human body?

Accepted Answer

To transform chemical energy (via ATP) into mechanical energy for movement

Question 2

A patient suffers a deep laceration that severs the perimysium of a skeletal muscle. Which structure is most directly affected?

Accepted Answer

Fascicles (bundles of muscle fibers)

Question 3

Which connective tissue sheath surrounds each individual muscle fiber?

Accepted Answer

Endomysium

Question 4

During a biceps curl, the biceps brachii muscle contracts and moves the forearm. What is the anatomical term for the attachment point on the radius where movement occurs?

Accepted Answer

Insertion

Question 5

Which of the following statements about skeletal muscle fibers is TRUE?

Accepted Answer

They are striated, multinucleate, and under voluntary control

Question 6

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

Accepted Answer

Muscle → Fascicle → Muscle fiber → Myofibril → Sarcomere

Question 7

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

Accepted Answer

It stores and releases $$Ca^{2+}$$ ions into the cytosol

Question 8

A triad in skeletal muscle consists of which three structures?

Accepted Answer

Two terminal cisterns of the SR and one T tubule

Question 9

Which protein forms the thick filaments in a sarcomere and is responsible for the power stroke during muscle contraction?

Accepted Answer

Myosin

Question 10

In the sarcomere, which band contains both actin and myosin filaments and is responsible for the striated appearance of skeletal muscle?

Accepted Answer

A band

Question 11

Which of the following is a correct description of the arrangement of myofilaments in the sarcomere cross-section at the outer edge of the A band?

Accepted Answer

One thick filament surrounded by six thin filaments in a hexagonal pattern

Question 12

Which regulatory proteins are bound to actin and help control muscle contraction?

Accepted Answer

Troponin and tropomyosin

Question 13

A muscle fiber is stimulated by a nerve impulse. Which structure allows the electrical signal to penetrate deep into the interior of the muscle fiber?

Accepted Answer

T tubule

Question 14

Which of the following is TRUE regarding cardiac muscle cells?

Accepted Answer

They are striated, branched, and connected by intercalated discs

Question 15

Which statement best explains why skeletal muscle fibers contain many mitochondria?

Accepted Answer

They require high amounts of energy (ATP) for contraction

Question 16

Which of the following is a function of the connective tissue sheaths in skeletal muscle?

Accepted Answer

They support and organize muscle fibers into bundles

Question 17

A patient with a genetic defect in the protein tropomyosin would most likely experience which of the following symptoms?

Accepted Answer

Difficulty regulating muscle contraction due to disrupted actin-myosin interaction

Question 18

Which equation best represents the transformation of chemical energy to mechanical energy in muscle contraction?

Accepted Answer

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

Question 19

Which of the following best describes the difference between direct and indirect muscle attachments?

Accepted Answer

Direct attachments involve connective tissue fusing to bone or cartilage, while indirect attachments involve connective tissue extending beyond muscle as tendon or aponeurosis

Question 20

Which of the following statements about smooth muscle is correct?

Accepted Answer

It is found in the walls of hollow organs and is not striated

Muscle Tissues and Skeletal Muscle Anatomy – Chapter 9 Study Notes

Study Guide - Practice Questions

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