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

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and __________.

troponin

tropomyosin

actin

myosin

thin filaments

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Verified step by step guidance

Understand the sliding filament model: This model explains how muscles contract by the sliding of actin and myosin filaments past each other, which shortens the sarcomere, the functional unit of a muscle fiber.

Identify the key players: In muscle contraction, the primary myofilaments involved are actin (thin filaments) and myosin (thick filaments).

Recognize the role of myosin: Myosin is a motor protein that interacts with actin to produce muscle contraction. It forms cross-bridges with actin filaments, pulling them inward during contraction.

Differentiate between actin and regulatory proteins: Actin is the main component of thin filaments, while troponin and tropomyosin are regulatory proteins that control the interaction between actin and myosin.

Conclude the interaction: In the sliding filament model, actin and myosin filaments slide past each other, leading to muscle contraction. Therefore, the correct answer to the problem is that actin overlaps with myosin.