Question 1

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

Accepted Answer

Contains vesicles

Question 2

During muscle contraction, which statement best describes the behavior of myofilaments?

Accepted Answer

Neither actin nor myosin filaments shorten; thin filaments slide past thick filaments.

Question 3

Which muscle type is striated and voluntary?

Accepted Answer

Skeletal muscle

Question 4

What is the primary neurotransmitter released at the neuromuscular junction to stimulate muscle contraction?

Accepted Answer

Acetylcholine

Question 5

Which enzyme breaks down acetylcholine in the synaptic cleft?

Accepted Answer

Cholinesterase

Question 6

A patient presents with progressive muscle weakness and is diagnosed with an autoimmune disorder that damages acetylcholine receptors. What is the most likely diagnosis?

Accepted Answer

Myasthenia gravis

Question 7

Which of the following is found in the sarcoplasm of a muscle fiber and serves as an energy reserve during exercise?

Accepted Answer

Glycogen

Question 8

Which muscle fiber type is best suited for endurance activities such as distance running?

Accepted Answer

Slow oxidative fibers

Question 9

What is the correct order of muscle connective tissue layers from innermost to outermost?

Accepted Answer

Endomysium, perimysium, epimysium

Question 10

Which of the following best describes the 'all-or-none response' in muscle fibers?

Accepted Answer

Muscle fibers either contract fully or not at all when threshold is reached.

Question 11

A muscle cell is stretched to twice its contracted length and then released. Which property allows it to return to its original length?

Accepted Answer

Elasticity

Question 12

Which disorder is characterized by progressive degeneration of motor neurons, leading to muscle atrophy and loss of voluntary movement?

Accepted Answer

Amyotrophic lateral sclerosis (ALS)

Question 13

Which of the following is the correct formula for the energy produced during cellular respiration in muscle cells?

Accepted Answer

$\mathrm{C_6H_{12}O_6} + 6\mathrm{O_2} \rightarrow 6\mathrm{CO_2} + 6\mathrm{H_2O} + \mathrm{ATP}$

Question 14

A person experiences sustained involuntary muscle contraction after a bacterial infection. Which toxin is most likely responsible?

Accepted Answer

Tetanus toxin

Question 15

Which structure in the neuromuscular junction stores neurotransmitters before they are released?

Accepted Answer

Synaptic vesicles

Question 16

Which of the following best explains why muscle fatigue occurs after prolonged exercise?

Accepted Answer

Accumulation of lactic acid due to insufficient oxygen for ATP production

Question 17

Which of the following is the correct sequence of events in the sliding filament theory of muscle contraction?

Accepted Answer

Acetylcholine is released, calcium ions bind to troponin, myosin heads attach to actin, filaments slide

Question 18

Which term describes the minimum stimulus required to initiate a muscle contraction?

Accepted Answer

Threshold stimulus

Question 19

A muscle is unable to relax after voluntary contraction, electrical stimulation, or being startled. What is this condition called?

Accepted Answer

Myotonia

Question 20

Which of the following best describes the role of creatine phosphate in muscle cells?

Accepted Answer

It increases regeneration of ATP during short, intense activity.

Chapter 9: Muscles and Muscle Tissue – Structure, Function, and Disorders

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