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 happens when a myosin head releases from actin during muscle contraction?

The myosin head causes the actin filament to shorten.

The myosin head remains attached to the same actin site.

The myosin head reattaches to a new actin site further along the filament.

The myosin head breaks down ATP into ADP and phosphate.

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Verified step by step guidance

Understand the role of myosin and actin in muscle contraction: Myosin heads bind to actin filaments to form cross-bridges, which are essential for muscle contraction.

Recognize the ATP cycle in muscle contraction: ATP binds to the myosin head, causing it to release from the actin filament. This is a crucial step in the contraction cycle.

Identify the reattachment process: After releasing from the actin, the myosin head hydrolyzes ATP into ADP and inorganic phosphate, which provides the energy needed for the myosin head to move to a new position.

Explain the power stroke: The myosin head reattaches to a new actin site further along the filament, and the release of ADP and phosphate triggers the power stroke, pulling the actin filament and causing muscle contraction.

Summarize the cycle: This process repeats as long as calcium ions and ATP are present, allowing continuous muscle contraction and relaxation.