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HESI A2 Anatomy & Physiology:
Muscular System Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What is the basic functional unit of a muscle fiber?✔✔Sarcomere
Which type of muscle is voluntary and striated?✔✔Skeletal muscle
Which type of muscle is involuntary and found in the heart?✔✔Cardiac muscle
What is the term for the ability of a muscle to return to its original length after stretching?✔✔Elasticity
Which connective tissue surrounds an individual muscle fiber?✔✔Endomysium 1 / 2
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What is the connective tissue layer that surrounds a bundle of muscle fibers?✔✔Perimysium
Which protein in muscle fibers binds oxygen for energy production?✔✔Myoglobin
What is the main energy molecule used during muscle contraction?
✔✔ATP
Which ion is necessary for muscle contraction to occur?✔✔Calcium
What is the neurotransmitter released at the neuromuscular junction?✔✔Acetylcholine
Which filament is primarily composed of the protein actin?✔✔Thin filament
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