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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

In a myofibril, which filaments stabilize the thick filaments and prevent over-stretching?

Tropomyosin filaments

Actin filaments

Titin filaments

Nebulin filaments

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Verified step by step guidance

Understand the structure of a myofibril: A myofibril is composed of repeating units called sarcomeres, which contain thick filaments (myosin) and thin filaments (actin). Supporting proteins help stabilize these filaments.

Identify the role of titin filaments: Titin is a large protein that spans from the Z-disc to the M-line in the sarcomere. It acts as a molecular spring, stabilizing the thick filaments and preventing over-stretching during muscle contraction and relaxation.

Compare titin with other filament types: Tropomyosin is a regulatory protein associated with actin filaments, helping to control muscle contraction. Actin filaments are the thin filaments involved in contraction. Nebulin filaments are associated with actin and help maintain its alignment but do not stabilize thick filaments.

Focus on the function of titin: Titin provides structural support and elasticity to the sarcomere, ensuring the thick filaments remain properly aligned and preventing excessive stretching that could damage the muscle.

Conclude that titin filaments are the correct answer: Based on their unique role in stabilizing thick filaments and preventing over-stretching, titin filaments are the correct choice in this context.