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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

9. Muscle Tissue

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

Which of the following events triggers the subsequent steps of excitation-contraction coupling?

Binding of ATP to myosin heads

Release of calcium ions from the sarcoplasmic reticulum

Hydrolysis of ATP to ADP and inorganic phosphate

Detachment of myosin from actin

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Verified step by step guidance

Understand the concept of excitation-contraction coupling: It is the physiological process of converting an electrical stimulus to a mechanical response in muscle fibers.

Identify the role of calcium ions: Calcium ions play a crucial role in muscle contraction by binding to troponin, which leads to the exposure of binding sites on actin filaments.

Recognize the source of calcium ions: The sarcoplasmic reticulum is an organelle in muscle cells that stores calcium ions and releases them upon receiving an action potential.

Determine the trigger event: The release of calcium ions from the sarcoplasmic reticulum is the key event that initiates the subsequent steps of muscle contraction.

Connect the trigger to the process: Once calcium ions are released, they bind to troponin, causing a conformational change that allows myosin heads to bind to actin, leading to muscle contraction.