Question 1

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

Accepted Answer

Storing calcium

Question 2

A patient presents with involuntary muscle contractions in the walls of their digestive tract. Which muscle type is primarily responsible for this action?

Accepted Answer

Smooth muscle

Question 3

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

During muscle contraction, which event occurs according to the sliding filament theory?

Accepted Answer

Myosin heads pull actin filaments toward the M-line

Question 5

Which structure stores calcium ions necessary for muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 6

A muscle fiber is stimulated by a motor neuron. What is the role of acetylcholine at the neuromuscular junction?

Accepted Answer

It depolarizes the sarcolemma, initiating an action potential

Question 7

Which of the following best describes a motor unit?

Accepted Answer

All muscle fibers innervated by a single motor neuron

Question 8

During a muscle twitch, which phase corresponds to the time between stimulus and onset of contraction?

Accepted Answer

Latent period

Question 9

Which muscle fiber type is most resistant to fatigue and relies primarily on aerobic metabolism?

Accepted Answer

Type I

Question 10

A muscle is held at a constant length while generating tension. Which type of contraction is this?

Accepted Answer

Isometric

Question 11

Which equation best represents the relationship between muscle force ($$F$$), cross-sectional area ($$A$$), and muscle tension ($$T$$)?

Accepted Answer

$$F = T 	imes A$$

Question 12

A patient is unable to relax their muscles after contraction, resulting in sustained muscle tension. Which condition is most likely occurring?

Accepted Answer

Complete tetanus

Question 13

Which of the following best explains muscle fatigue?

Accepted Answer

Accumulation of lactic acid and depletion of ATP

Question 14

Which component of the sarcomere shortens during muscle contraction?

Accepted Answer

I-band

Question 15

In a scenario where a muscle is stretched beyond its optimal length, what happens to the tension it can generate?

Accepted Answer

Tension decreases due to reduced overlap of actin and myosin

Question 16

Which of the following is TRUE regarding smooth muscle compared to skeletal muscle?

Accepted Answer

Smooth muscle has non-striated filaments and is involuntary

Question 17

A patient with muscular dystrophy experiences progressive muscle weakness. Which best describes the pathophysiology?

Accepted Answer

Degeneration of muscle fibers due to genetic defects

Question 18

Which event occurs FIRST during skeletal muscle contraction?

Accepted Answer

Binding of acetylcholine to receptors on the motor end plate

Question 19

Which formula best represents the calculation of muscle power ($$P) $$given force ($$F) $$and velocity ($$v$$)?

Accepted Answer

$$P = F 	imes v$$

Question 20

A muscle fiber type that contracts quickly, fatigues rapidly, and uses anaerobic metabolism is most likely:

Accepted Answer

Type IIb

Muscle Tissue and Contraction Study Guide – Anatomy & Physiology Guidance

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