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A&P 1 101 Module 5 – Muscular System
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED
PASS <BRAND NEW VERSION 2025>
1. Which type of muscle tissue is involuntary and striated, found only in the heart?
Answer: Cardiac muscle
2. What is the basic functional unit of a muscle fiber responsible for contraction?
Answer: Sarcomere
3. Which protein blocks myosin-binding sites on actin molecules in a resting
muscle?
Answer: Tropomyosin
4. What neurotransmitter is released at the neuromuscular junction to initiate
muscle contraction?
Answer: Acetylcholine
, 2
5. What is the role of calcium ions in muscle contraction?
Answer: Binds to troponin
6. Which muscle type has the ability to remain contracted for long periods without
fatigue?
Answer: Smooth muscle
7. During a muscle contraction, which filament slides over the other?
Answer: Actin over myosin
8. What structure stores and releases calcium ions during muscle contraction?
Answer: Sarcoplasmic reticulum
9. What is the name of the point where a motor neuron communicates with a
skeletal muscle fiber?
Answer: Neuromuscular junction
10. What enzyme breaks down acetylcholine in the synaptic cleft?
Answer: Acetylcholinesterase
11. Which type of muscle tissue is multinucleated and voluntary?
Answer: Skeletal muscle
, 3
12. Which molecule provides the immediate source of energy for muscle
contraction?
Answer: ATP
13. What term describes the minimum stimulus needed to cause a muscle fiber to
contract?
Answer: Threshold stimulus
14. What is a sustained, involuntary contraction of a muscle called?
Answer: Spasm
15. What is the connective tissue that surrounds each individual muscle fiber?
Answer: Endomysium
16. What causes the striated appearance of skeletal muscle?
Answer: Arrangement of actin and myosin
17. What is the name of the process in which muscle tension increases but the
muscle does not shorten?
Answer: Isometric contraction
18. What type of contraction involves a muscle shortening while producing
movement?
Answer: Concentric contraction
, 4
19. Which part of the muscle fiber conducts impulses deep into the cell?
Answer: T-tubules
20. What condition results from lack of ATP causing sustained contraction of
muscles after death?
Answer: Rigor mortis
21. Which muscle structure contains the myofibrils and is surrounded by the
sarcolemma?
Answer: Muscle fiber
22. Which phase of a muscle twitch involves the release of calcium and the start of
cross-bridge formation?
Answer: Contraction phase
23. What is the outermost connective tissue layer that surrounds the entire muscle?
Answer: Epimysium
24. What is the term for a brief, single contraction of all muscle fibers in a motor
unit?
Answer: Twitch
A&P 1 101 Module 5 – Muscular System
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED
PASS <BRAND NEW VERSION 2025>
1. Which type of muscle tissue is involuntary and striated, found only in the heart?
Answer: Cardiac muscle
2. What is the basic functional unit of a muscle fiber responsible for contraction?
Answer: Sarcomere
3. Which protein blocks myosin-binding sites on actin molecules in a resting
muscle?
Answer: Tropomyosin
4. What neurotransmitter is released at the neuromuscular junction to initiate
muscle contraction?
Answer: Acetylcholine
, 2
5. What is the role of calcium ions in muscle contraction?
Answer: Binds to troponin
6. Which muscle type has the ability to remain contracted for long periods without
fatigue?
Answer: Smooth muscle
7. During a muscle contraction, which filament slides over the other?
Answer: Actin over myosin
8. What structure stores and releases calcium ions during muscle contraction?
Answer: Sarcoplasmic reticulum
9. What is the name of the point where a motor neuron communicates with a
skeletal muscle fiber?
Answer: Neuromuscular junction
10. What enzyme breaks down acetylcholine in the synaptic cleft?
Answer: Acetylcholinesterase
11. Which type of muscle tissue is multinucleated and voluntary?
Answer: Skeletal muscle
, 3
12. Which molecule provides the immediate source of energy for muscle
contraction?
Answer: ATP
13. What term describes the minimum stimulus needed to cause a muscle fiber to
contract?
Answer: Threshold stimulus
14. What is a sustained, involuntary contraction of a muscle called?
Answer: Spasm
15. What is the connective tissue that surrounds each individual muscle fiber?
Answer: Endomysium
16. What causes the striated appearance of skeletal muscle?
Answer: Arrangement of actin and myosin
17. What is the name of the process in which muscle tension increases but the
muscle does not shorten?
Answer: Isometric contraction
18. What type of contraction involves a muscle shortening while producing
movement?
Answer: Concentric contraction
, 4
19. Which part of the muscle fiber conducts impulses deep into the cell?
Answer: T-tubules
20. What condition results from lack of ATP causing sustained contraction of
muscles after death?
Answer: Rigor mortis
21. Which muscle structure contains the myofibrils and is surrounded by the
sarcolemma?
Answer: Muscle fiber
22. Which phase of a muscle twitch involves the release of calcium and the start of
cross-bridge formation?
Answer: Contraction phase
23. What is the outermost connective tissue layer that surrounds the entire muscle?
Answer: Epimysium
24. What is the term for a brief, single contraction of all muscle fibers in a motor
unit?
Answer: Twitch
