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 sliding filament theory, what part of the myosin filaments binds to actin?

Myosin hinge region

Myosin heads

Myosin light chains

Myosin tails

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Verified step by step guidance

Begin by understanding the sliding filament theory, which explains how muscles contract at the molecular level. It involves the interaction between actin and myosin filaments within the sarcomere, the functional unit of muscle fibers.

Identify the structure of myosin filaments. Myosin is a protein with several distinct regions: the myosin heads, the hinge region, the light chains, and the tails. Each part plays a specific role in muscle contraction.

Focus on the myosin heads. These are the globular parts of the myosin molecule that protrude from the filament. They are crucial for muscle contraction as they bind to actin filaments.

Understand the role of myosin heads in the contraction process. During muscle contraction, the myosin heads attach to binding sites on the actin filaments, forming cross-bridges. This interaction is powered by ATP, leading to the sliding of filaments past each other, shortening the sarcomere.

Conclude that the myosin heads are the part of the myosin filaments that bind to actin, facilitating the contraction process as described in the sliding filament theory.