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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 the consequence if the myosin heads cannot bind to the actin during muscle contraction?

Muscle contraction will not occur.

The sarcomere will shorten.

ATP will not be hydrolyzed.

Calcium ions will not be released from the sarcoplasmic reticulum.

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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 importance of calcium ions: Calcium ions bind to troponin, causing a conformational change that moves tropomyosin away from the binding sites on actin, allowing myosin heads to attach.

Consider the role of ATP: ATP is necessary for the myosin heads to detach from actin and re-cock for another cycle of binding and pulling, which is crucial for muscle contraction.

Analyze the consequence of myosin heads not binding to actin: If myosin heads cannot bind to actin, cross-bridge formation does not occur, preventing muscle contraction.

Evaluate the impact on the sarcomere and ATP: Without cross-bridge cycling, the sarcomere will not shorten, and ATP will not be hydrolyzed as there is no detachment and re-cocking of myosin heads.