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 calcium ions bind to troponin during muscle contraction?

Myosin heads detach from actin filaments.

The sarcoplasmic reticulum releases more calcium ions.

ATP is hydrolyzed to provide energy for muscle contraction.

Tropomyosin shifts to expose binding sites on actin filaments.

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Verified step by step guidance

Understand the role of calcium ions in muscle contraction: Calcium ions are crucial for the regulation of muscle contraction. They bind to troponin, a regulatory protein associated with the actin filaments in muscle cells.

Identify the components involved: Troponin is part of the troponin-tropomyosin complex that regulates the interaction between actin and myosin, the proteins responsible for muscle contraction.

Explain the binding process: When calcium ions bind to troponin, it causes a conformational change in the troponin-tropomyosin complex.

Describe the effect of this binding: The conformational change shifts tropomyosin away from the myosin-binding sites on the actin filaments, exposing these sites.

Conclude with the result of this exposure: With the binding sites exposed, myosin heads can attach to actin, leading to muscle contraction through the sliding filament mechanism.