Table of contents

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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

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 released when myosin heads attach to actin filaments during muscle contraction according to the sliding filament theory?

Lactic acid

ATP

ADP and inorganic phosphate

Calcium ions

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Verified step by step guidance

Understand the sliding filament theory, which explains how muscles contract by the interaction of actin and myosin filaments.

Recognize that during muscle contraction, myosin heads bind to actin filaments forming a cross-bridge.

Know that ATP binds to the myosin head, and is hydrolyzed to ADP and inorganic phosphate, providing the energy for the myosin head to attach to actin.

When the myosin head attaches to the actin filament, ADP and inorganic phosphate are released, which triggers the power stroke that pulls the actin filament inward.

This release of ADP and inorganic phosphate is crucial for the continuation of the contraction cycle, allowing the myosin head to detach and reattach for further contraction.