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 context of the sliding filament theory, how do myosin and actin interact with each other during muscle contraction?

Actin heads attach to myosin filaments, which then push the actin filaments outward.

Myosin heads bind to actin filaments, forming cross-bridges, and pull the actin filaments toward the center of the sarcomere.

Actin filaments bind to myosin heads, causing the myosin to slide past the actin filaments.

Myosin filaments shorten, pulling actin filaments along with them to contract the muscle.

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Verified step by step guidance

Understand the basic components involved in the sliding filament theory: myosin and actin are the primary proteins, with myosin being the thick filament and actin being the thin filament.

Recognize that during muscle contraction, myosin heads bind to specific sites on the actin filaments, forming what are known as cross-bridges.

Once the cross-bridges are formed, the myosin heads pivot, pulling the actin filaments toward the center of the sarcomere. This action is often described as a 'power stroke.'

As the actin filaments are pulled inward, the sarcomere shortens, leading to muscle contraction. This process is repeated multiple times during a contraction cycle.

Note that ATP is required for the myosin heads to detach from the actin filaments and re-cock for another cycle of binding and pulling, allowing the process to continue as long as calcium ions and ATP are present.