Question 1

Which of the following best describes the difference between a tendon and a ligament?

Accepted Answer

A tendon attaches muscle to bone or other structures, while a ligament attaches bone to bone.

Question 2

Which connective tissue layer surrounds individual muscle fibers within a skeletal muscle?

Accepted Answer

Endomysium

Question 3

During muscle contraction, which ion is released from the sarcoplasmic reticulum to initiate the cross-bridge cycle?

Accepted Answer

Calcium ($$\mathrm{Ca$$^{2+}$$})$$

Question 4

Which of the following is the correct sequence of events in the cross-bridge cycle of muscle contraction?

Accepted Answer

Myosin binds to actin, power stroke occurs, ATP binds to myosin, myosin releases actin

Question 5

A patient presents with difficulty moving their eye laterally. Which extra-ocular muscle is most likely impaired?

Accepted Answer

Lateral rectus

Question 6

Which muscle is primarily responsible for flexion at the elbow joint?

Accepted Answer

Biceps brachii

Question 7

Which of the following statements about motor units is correct?

Accepted Answer

A motor unit consists of a single motor neuron and all the muscle fibers it innervates.

Question 8

Which muscle group is most important for adduction of the thigh?

Accepted Answer

Adductor group (adductor brevis, longus, magnus, pectineus, gracilis)

Question 9

A rugby player suffers a blow to the thigh and develops acute compartment syndrome. What is the primary physiological concern in this condition?

Accepted Answer

Reduced oxygen and nutrient delivery due to increased pressure

Question 10

Which muscle is part of the rotator cuff and is responsible for abduction of the arm?

Accepted Answer

Supraspinatus

Question 11

Which of the following best explains why skeletal muscle fibers have multiple nuclei?

Accepted Answer

They are formed by the fusion of multiple myoblasts during development.

Question 12

Which structure in a sarcomere marks the boundary between adjacent sarcomeres?

Accepted Answer

Z-line (Z-disc)

Question 13

Which of the following muscles is NOT part of the hamstring group?

Accepted Answer

Rectus femoris

Question 14

Which muscle is primarily responsible for flattening the dome of the thoracic cavity during inspiration?

Accepted Answer

Diaphragm

Question 15

Which of the following best describes the arrangement of fascicles in a muscle that can contract over a long distance but is relatively weak?

Accepted Answer

Parallel arrangement

Question 16

Which of the following equations correctly represents the relationship between force ($$F$$), cross-sectional area ($$A$$), and stress ($$\sigma) in $$muscle physiology?

Accepted Answer

$$F = \sigma 	imes A$$

Question 17

A sprinter is found to have a higher proportion of fast-twitch muscle fibers compared to a marathon runner. Which property is most associated with fast-twitch fibers?

Accepted Answer

Rapid contraction and quick fatigue

Question 18

Which muscle is responsible for unlocking the knee joint during the initial phase of flexion?

Accepted Answer

Popliteus

Question 19

Which of the following best describes the role of the sarcolemma in skeletal muscle contraction?

Accepted Answer

It transmits electrical signals from the neuromuscular junction to the T-tubules.

Question 20

A patient is unable to abduct their arm at the shoulder. Which nerve or muscle is most likely affected?

Accepted Answer

Supraspinatus muscle

Muscular System: Structure, Function, and Classification

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