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

What is the role of calcium in the cross-bridge cycle during muscle contraction?

Calcium directly hydrolyzes ATP to provide energy for muscle contraction.

Calcium binds to troponin, causing a conformational change that exposes binding sites on actin.

Calcium binds to myosin, initiating the power stroke of the cross-bridge cycle.

Calcium provides the energy required for the myosin head to detach from actin.

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Verified step by step guidance

Understand the cross-bridge cycle: The cross-bridge cycle is a series of molecular events that occur during muscle contraction, involving the interaction between actin and myosin filaments.

Identify the role of calcium: Calcium ions play a crucial role in regulating the interaction between actin and myosin by binding to specific proteins.

Focus on troponin: Calcium binds to the protein troponin, which is part of the thin filament structure in muscle fibers.

Explain the conformational change: When calcium binds to troponin, it causes a conformational change in the troponin-tropomyosin complex, which exposes the binding sites on actin for myosin attachment.

Relate to muscle contraction: This exposure of binding sites allows myosin heads to attach to actin, forming cross-bridges, and initiating the power stroke that leads to muscle contraction.