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Portage A&P1 L6 Exam Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What type of muscle contraction is controlled by pacemaker cells?✔✔ Cardiac muscle contraction
What type of muscle is responsible for voluntary body movement?✔✔ Skeletal muscle
What type of muscle lines the walls of hollow internal organs?✔✔ Smooth muscle
What type of muscle is striated and under involuntary control?✔✔ Cardiac muscle
What is the name of the site where a neuron communicates with a muscle fiber?✔✔ Neuromuscular junction
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What is released by the neuron to stimulate muscle contraction?✔✔ Acetylcholine
What enzyme breaks down acetylcholine in the synaptic cleft?✔✔ Acetylcholinesterase
What ion is released from the sarcoplasmic reticulum during contraction?✔✔ Calcium
What is the primary energy molecule used for muscle contraction?
✔✔ ATP
What is the repeating structural unit of a myofibril in skeletal muscle?✔✔ Sarcomere
What filament in the sarcomere contains cross-bridges for contraction?✔✔ Myosin
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