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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 explained by the sliding filament theory?

The mechanism of muscle contraction at the molecular level.

The process of nerve impulse transmission across synapses.

The generation of action potentials in neurons.

The regulation of calcium ions in the bloodstream.

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Verified step by step guidance

Begin by understanding the sliding filament theory, which explains the mechanism of muscle contraction at the molecular level.

Recognize that muscle contraction involves the interaction between actin and myosin filaments within the sarcomere, the functional unit of muscle fibers.

Learn that during contraction, myosin heads bind to actin filaments, forming cross-bridges, and then pivot to pull the actin filaments toward the center of the sarcomere.

Understand that ATP is required for the myosin heads to detach from the actin and re-cock, allowing the cycle to repeat and the muscle to contract further.

Note that calcium ions play a crucial role by binding to troponin, which causes a conformational change in tropomyosin, exposing the binding sites on actin for myosin attachment.