Portage Learning: A&P 1 Module 5 -
Muscular System Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
What type of muscle tissue is found in the walls of hollow organs?
✔✔ Smooth muscle
What protein in muscle fibers binds to oxygen for cellular respiration?
✔✔ Myoglobin
What ion is essential for muscle contraction to occur?
✔✔ Calcium
What neurotransmitter is released at the neuromuscular junction?
✔✔ Acetylcholine
What is the name of the functional unit of a skeletal muscle fiber?
✔✔ Sarcomere
1
,What structure stores calcium in muscle cells?
✔✔ Sarcoplasmic reticulum
What molecule supplies the energy needed for muscle contraction?
✔✔ ATP
What happens when ATP is no longer available in a muscle cell?
✔✔ Rigor mortis
What connective tissue layer surrounds an individual muscle fiber?
✔✔ Endomysium
What is the term for the point where a muscle attaches to a movable bone?
✔✔ Insertion
What type of muscle contraction results in shortening of the muscle?
✔✔ Concentric contraction
2
,What type of muscle contraction increases tension but does not change length?
✔✔ Isometric contraction
What is the name of the gap between a neuron and a muscle cell?
✔✔ Synaptic cleft
What type of muscle fibers are used for quick, powerful bursts of movement?
✔✔ Fast-twitch fibers
What part of the muscle cell contains actin and myosin?
✔✔ Myofibril
What is the role of tropomyosin in muscle contraction?
✔✔ Blocks binding sites on actin
What causes the striated appearance of skeletal muscle?
✔✔ Arrangement of sarcomeres
3
, What enzyme breaks down acetylcholine in the synaptic cleft?
✔✔ Acetylcholinesterase
What is the muscle responsible for producing a specific movement called?
✔✔ Prime mover
What is the role of synergist muscles during movement?
✔✔ Assist the prime mover
What is the function of the antagonist muscle during a movement?
✔✔ Opposes the prime mover
What structure connects muscle to bone?
✔✔ Tendon
What condition is characterized by chronic muscle pain and tenderness?
✔✔ Fibromyalgia
4
Muscular System Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
What type of muscle tissue is found in the walls of hollow organs?
✔✔ Smooth muscle
What protein in muscle fibers binds to oxygen for cellular respiration?
✔✔ Myoglobin
What ion is essential for muscle contraction to occur?
✔✔ Calcium
What neurotransmitter is released at the neuromuscular junction?
✔✔ Acetylcholine
What is the name of the functional unit of a skeletal muscle fiber?
✔✔ Sarcomere
1
,What structure stores calcium in muscle cells?
✔✔ Sarcoplasmic reticulum
What molecule supplies the energy needed for muscle contraction?
✔✔ ATP
What happens when ATP is no longer available in a muscle cell?
✔✔ Rigor mortis
What connective tissue layer surrounds an individual muscle fiber?
✔✔ Endomysium
What is the term for the point where a muscle attaches to a movable bone?
✔✔ Insertion
What type of muscle contraction results in shortening of the muscle?
✔✔ Concentric contraction
2
,What type of muscle contraction increases tension but does not change length?
✔✔ Isometric contraction
What is the name of the gap between a neuron and a muscle cell?
✔✔ Synaptic cleft
What type of muscle fibers are used for quick, powerful bursts of movement?
✔✔ Fast-twitch fibers
What part of the muscle cell contains actin and myosin?
✔✔ Myofibril
What is the role of tropomyosin in muscle contraction?
✔✔ Blocks binding sites on actin
What causes the striated appearance of skeletal muscle?
✔✔ Arrangement of sarcomeres
3
, What enzyme breaks down acetylcholine in the synaptic cleft?
✔✔ Acetylcholinesterase
What is the muscle responsible for producing a specific movement called?
✔✔ Prime mover
What is the role of synergist muscles during movement?
✔✔ Assist the prime mover
What is the function of the antagonist muscle during a movement?
✔✔ Opposes the prime mover
What structure connects muscle to bone?
✔✔ Tendon
What condition is characterized by chronic muscle pain and tenderness?
✔✔ Fibromyalgia
4
