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

In the sliding filament theory, what causes the myosin head to disconnect from actin?

The binding of ATP to the myosin head

The hydrolysis of ATP to ADP and inorganic phosphate

The release of calcium ions from the sarcoplasmic reticulum

The binding of calcium ions to troponin

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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 sarcomere and thus the muscle.

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

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

Consider the process of ATP hydrolysis: After ATP binds to the myosin head, it is hydrolyzed to ADP and inorganic phosphate, which provides the energy needed for the myosin head to return to its original position.

Understand the role of calcium ions: Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, which causes a conformational change that allows myosin heads to bind to actin. However, the detachment of myosin from actin is specifically triggered by ATP binding.