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

Sliding Filament Theory and the Sacromere

Anatomy & Physiology

9. Muscle Tissue

Sliding Filament Theory and the Sacromere

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Multiple Choice

The binding of calcium to which molecule causes the myosin binding sites on actin to be exposed?

Troponin

Actin

Myosin

Tropomyosin

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Verified step by step guidance

Understand the role of calcium in muscle contraction: Calcium ions play a crucial role in the process of muscle contraction by interacting with specific proteins within the muscle fibers.

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

Recognize the function of troponin: Troponin is a complex of three proteins that is attached to tropomyosin and actin in the muscle cells. It is responsible for regulating the interaction between actin and myosin.

Determine the effect of calcium binding: When calcium ions bind to troponin, it causes a conformational change in the troponin complex.

Explain the exposure of myosin binding sites: The conformational change in troponin moves tropomyosin away from the myosin binding sites on actin, thereby exposing these sites and allowing myosin to bind to actin, leading to muscle contraction.