Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

10. Muscles

Muscle Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Multiple Choice

Triggering of the muscle action potential occurs after which of the following events?

Calcium ions are pumped back into the sarcoplasmic reticulum

ATP is hydrolyzed to ADP and phosphate

Acetylcholine binds to receptors on the motor end plate

Myosin heads detach from actin filaments

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Verified step by step guidance

Step 1: Understand the context of muscle contraction. Muscle action potential is initiated at the neuromuscular junction, where a motor neuron communicates with a muscle fiber.

Step 2: Recall the role of acetylcholine (ACh). Acetylcholine is a neurotransmitter released from the motor neuron into the synaptic cleft, where it binds to receptors on the motor end plate of the muscle fiber.

Step 3: Recognize the sequence of events. When acetylcholine binds to its receptors, it triggers the opening of ion channels, leading to an influx of sodium ions (Na+) into the muscle cell. This depolarization generates the muscle action potential.

Step 4: Differentiate the other options. Calcium ions being pumped back into the sarcoplasmic reticulum occurs during muscle relaxation, ATP hydrolysis is part of the cross-bridge cycle, and myosin heads detaching from actin filaments is also part of the relaxation phase.

Step 5: Conclude that the correct event leading to the triggering of the muscle action potential is acetylcholine binding to receptors on the motor end plate, as this initiates the electrical signal required for muscle contraction.