Question 1

Which of the following best describes the structure of a synovial joint?

Accepted Answer

A joint where bones are separated by a fluid-filled cavity and surrounded by an articular capsule.

Question 2

Which of the following movements is an example of angular motion at a synovial joint?

Accepted Answer

Flexion of the elbow, decreasing the angle between the forearm and upper arm.

Question 3

A patient presents with pain and swelling at the knee after twisting the leg. The doctor diagnoses a sprain. Which tissue is primarily affected in a sprain?

Accepted Answer

Ligaments

Question 4

Which protein is found on the thin filaments of skeletal muscle and is responsible for regulating contraction?

Accepted Answer

Troponin

Question 5

During muscle contraction, which event occurs first after the action potential reaches the neuromuscular junction?

Accepted Answer

Binding of acetylcholine to receptors on the motor end plate

Question 6

Which equation correctly represents the breakdown of creatine phosphate to regenerate ATP during intense muscle activity?

Accepted Answer

$\mathrm{CP} + \mathrm{ADP} \rightarrow \mathrm{ATP} + \mathrm{Creatine}$

Question 7

Which type of muscle tissue is characterized by branching cells, intercalated discs, and is involuntary?

Accepted Answer

Cardiac muscle

Question 8

A patient with rheumatoid arthritis is most likely to experience which of the following changes in their joints?

Accepted Answer

Inflammation of the synovial membrane and joint capsule

Question 9

Which of the following best explains why skeletal muscle appears striated under the microscope?

Accepted Answer

Alternating bands of actin and myosin filaments

Question 10

Which phase of a muscle twitch is characterized by a short delay after the action potential, before tension is observed in the muscle?

Accepted Answer

Latent period

Question 11

Which of the following is true regarding the Na+/K+ pump in muscle cells?

Accepted Answer

It requires ATP to function and helps maintain the resting membrane potential.

Question 12

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 13

Which of the following best describes the difference between a strain and a sprain?

Accepted Answer

A strain is an injury to a muscle or tendon; a sprain is an injury to a ligament.

Question 14

Which of the following is a function of the sarcoplasmic reticulum in skeletal muscle cells?

Accepted Answer

Storing and releasing calcium ions during contraction

Question 15

Which type of cartilage is found in the intervertebral discs and is known for its strength and ability to absorb shock?

Accepted Answer

Fibrocartilage

Question 16

Which of the following best describes the role of motor units in muscle contraction?

Accepted Answer

A motor unit is one motor neuron and all the muscle fibers it innervates.

Question 17

Which of the following equations represents aerobic cellular respiration in muscle cells?

Accepted Answer

$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + \mathrm{ATP}$

Question 18

Which of the following is a characteristic of smooth muscle tissue?

Accepted Answer

Single, centrally located nucleus and involuntary control

Question 19

Which event occurs during the contraction phase of a muscle twitch?

Accepted Answer

Cross-bridges form between actin and myosin, generating tension.

Question 20

Which of the following best explains why cardiac muscle cells contract in a coordinated manner?

Accepted Answer

They contain gap junctions that allow electrical signals to pass rapidly between cells.

Joints and Muscle Structure: Study Notes for Anatomy & Physiology

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