Question 1

Which of the following best describes the structural difference between fibrous, cartilaginous, and synovial joints?

Accepted Answer

Fibrous joints are connected by dense connective tissue, cartilaginous joints by cartilage, and synovial joints by a fluid-filled cavity.

Question 2

A patient presents with a muscle disorder affecting the sarcoplasmic reticulum. Which function is most likely impaired?

Accepted Answer

Storage and release of calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$for muscle contraction.

Question 3

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

Accepted Answer

Production of hormones.

Question 4

During muscle contraction, which sarcomere region shortens while the A-band remains unchanged?

Accepted Answer

I-band

Question 5

Which equation best represents the resting membrane potential ($$V_{m}) of a $$skeletal muscle cell?

Accepted Answer

$$V_{m} = \frac{RT}{F} \ln \left( \frac{[K^+]_{out}}{[K^+]_{in}} \right)$$

Question 6

Which of the following best explains the process of depolarization in excitable tissues?

Accepted Answer

Rapid influx of $$\mathrm{Na^+}$$ ions through voltage-gated channels.

Question 7

Which structure in skeletal muscle is responsible for transmitting the action potential deep into the muscle fiber?

Accepted Answer

T tubules

Question 8

A toxin blocks ligand-gated channels at the neuromuscular junction. What is the most immediate effect?

Accepted Answer

Prevention of $$\mathrm{Na^+}$$ influx, inhibiting muscle fiber depolarization.

Question 9

Which of the following correctly matches the muscle tissue type with its characteristic?

Accepted Answer

Cardiac muscle: striated, involuntary, contains intercalated discs.

Question 10

Which event occurs first during excitation-contraction coupling in skeletal muscle?

Accepted Answer

Release of acetylcholine at the neuromuscular junction.

Question 11

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 12

During the cross-bridge cycle, what causes the myosin head to detach from actin?

Accepted Answer

Binding of ATP to the myosin head.

Question 13

Which of the following best describes the sliding filament model of muscle contraction?

Accepted Answer

Actin and myosin filaments slide past each other, shortening the sarcomere.

Question 14

Which band or zone disappears during maximal muscle contraction?

Accepted Answer

H-zone

Question 15

Which scenario best illustrates the function of aponeuroses in the human body?

Accepted Answer

Connecting muscle to muscle, such as the abdominal aponeurosis.

Question 16

Which statement about smooth muscle contraction is correct compared to skeletal muscle?

Accepted Answer

Smooth muscle contraction is slower and can be sustained for longer periods.

Question 17

Which of the following is a non-contractile component of the sarcomere?

Accepted Answer

Z-line (Z-disc)

Question 18

A patient with a mutation in voltage-gated $$\mathrm{Na^+}$$ channels would most likely experience which symptom?

Accepted Answer

Impaired ability to initiate action potentials in muscle fibers.

Question 19

Which step occurs LAST in the cross-bridge cycle?

Accepted Answer

ATP binds to myosin, causing detachment from actin.

Joints and Muscle Tissue: Study Guide (Chapters 8-9)

Study Guide - Practice Questions