Skeletal Muscle Physiology and Neuromuscular Junction Quiz
Test your knowledge on skeletal muscle function, neuromuscular junction, and muscle contraction mechanisms with these 13 questions.
#1
What is the function of skeletal muscles in the body?
To support and protect internal organs
To generate heat for the body
To produce movement
To aid in digestion
#2
Which of the following is NOT a structural component of a skeletal muscle?
Tendon
Epimysium
Endomysium
Sarcolemma
#3
What is the role of acetylcholine in the neuromuscular junction?
To inhibit muscle contraction
To trigger muscle contraction
To relax muscles
To regulate muscle growth
#4
What is the primary neurotransmitter released at the neuromuscular junction?
Dopamine
Acetylcholine
Serotonin
GABA
#5
What is the purpose of the motor end plate in the neuromuscular junction?
To synthesize acetylcholine
To release neurotransmitters
To propagate action potentials
To connect the muscle to the tendon
#6
What is the name of the protein that covers the binding sites on actin molecules, preventing myosin from binding to them in a muscle at rest?
Tropomyosin
Troponin
Myosin
Actin
#7
Which of the following is a characteristic of fast-twitch muscle fibers?
High resistance to fatigue
Low myoglobin content
Rich capillary supply
Predominantly oxidative metabolism
#8
Which molecule binds to calcium ions to initiate muscle contraction?
Troponin
Tropomyosin
Actin
Myosin
#9
What is the role of ATP in muscle contraction?
To bind to myosin heads and release them from actin
To increase the calcium ion concentration in the muscle cell
To break the cross-bridge between actin and myosin
To stabilize the muscle cell membrane
#10
Which of the following is responsible for the rapid release of calcium ions into the muscle cell during muscle contraction?
Sarcoplasmic reticulum
T-tubules
Myofibrils
Sarcolemma
#11
Which of the following statements about muscle fatigue is true?
It is primarily caused by the depletion of calcium ions in the muscle cell
It is the result of a buildup of lactic acid in the muscle
It is due to a decrease in the release of acetylcholine at the neuromuscular junction
It is caused by the accumulation of ATP in the muscle cell
#12
During muscle contraction, what happens to the distance between the Z-lines in a sarcomere?
It decreases
It remains constant
It increases
It depends on the muscle fiber type
#13
What is the role of calcium ions in muscle contraction?
To bind to troponin and remove the blocking action of tropomyosin
To bind to myosin and release it from actin
To trigger the release of acetylcholine at the neuromuscular junction
To generate ATP for muscle contraction
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