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 causes the release of myosin heads from actin filaments after the power stroke in the sliding filament theory?

Hydrolysis of ATP to ADP and inorganic phosphate

Release of calcium ions from the sarcoplasmic reticulum

Binding of ATP to the myosin head

Attachment of myosin heads to new actin sites

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Verified step by step guidance

Understand the sliding filament theory: This theory explains how muscles contract by the sliding of actin and myosin filaments past each other, which shortens the muscle fiber.

Identify the role of ATP in muscle contraction: ATP is crucial for muscle contraction and relaxation. It provides the energy needed for the myosin heads to detach from the actin filaments after the power stroke.

Recognize the power stroke: During the power stroke, the myosin head pivots, pulling the actin filament toward the center of the sarcomere. This action requires energy, which is initially provided by the hydrolysis of ATP.

Explain the release of myosin heads: After the power stroke, ATP binds to the myosin head. This binding causes a conformational change in the myosin head, reducing its affinity for actin and leading to the release of the myosin head from the actin filament.

Conclude with the role of ATP binding: The binding of a new ATP molecule to the myosin head is essential for the detachment of the myosin head from the actin filament, allowing the cycle to repeat and the muscle to continue contracting.