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

9. Muscle Tissue

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

How do calcium ions initiate contraction in skeletal muscle fibers?

By breaking down ATP to provide energy for muscle contraction.

By directly binding to myosin heads, enabling them to attach to actin filaments.

By increasing the energy supply to muscle fibers, allowing for contraction.

By binding to troponin, causing a conformational change that exposes binding sites on actin filaments.

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Verified step by step guidance

Understand the role of calcium ions in muscle contraction: Calcium ions are crucial for initiating the contraction process in skeletal muscle fibers.

Identify the key proteins involved: Troponin, tropomyosin, actin, and myosin are the main proteins involved in muscle contraction.

Explain the resting state: In a relaxed muscle, tropomyosin blocks the binding sites on actin filaments, preventing myosin heads from attaching.

Describe the role of calcium ions: When a muscle fiber is stimulated, calcium ions are released from the sarcoplasmic reticulum and bind to troponin.

Explain the conformational change: The binding of calcium to troponin causes a conformational change that moves tropomyosin away from the binding sites on actin, allowing myosin heads to attach and initiate contraction.