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 to a sarcomere during a myosin power stroke?

The sarcomere shortens as actin filaments slide over myosin filaments.

The sarcomere lengthens as myosin filaments slide over actin filaments.

The sarcomere shortens as myosin filaments are pulled towards the Z line.

The sarcomere remains the same length as actin and myosin filaments detach.

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, composed of actin (thin) and myosin (thick) filaments. It is bordered by Z lines.

Identify the role of myosin and actin: During muscle contraction, myosin heads bind to actin filaments forming cross-bridges, and pull the actin filaments towards the center of the sarcomere.

Describe the power stroke: The power stroke is the action where the myosin head pivots, pulling the actin filament towards the center of the sarcomere, which results in the shortening of the sarcomere.

Explain the sliding filament theory: This theory states that muscle contraction occurs as actin filaments slide over myosin filaments, leading to the shortening of the sarcomere without changing the length of the filaments themselves.

Conclude the effect on the sarcomere: During a myosin power stroke, the sarcomere shortens as the actin filaments slide over the myosin filaments, bringing the Z lines closer together.