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

Structure of a Skeletal Muscle

Anatomy & Physiology

9. Muscle Tissue

Structure of a Skeletal Muscle

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Multiple Choice

Which protein is found in thin filaments but is not a regulatory protein?

Actin

Myosin

Troponin

Tropomyosin

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Verified step by step guidance

Understand the structure of a muscle fiber: Muscle fibers contain myofibrils, which are composed of repeating units called sarcomeres. Each sarcomere contains thin and thick filaments.

Identify the components of thin filaments: Thin filaments are primarily composed of actin, along with regulatory proteins such as troponin and tropomyosin.

Differentiate between structural and regulatory proteins: Actin is a structural protein that forms the backbone of the thin filament, while troponin and tropomyosin are regulatory proteins that control muscle contraction.

Recognize the role of actin: Actin is the main protein in thin filaments that interacts with myosin during muscle contraction, but it is not involved in regulation like troponin and tropomyosin.

Conclude that actin is the protein found in thin filaments that is not a regulatory protein, distinguishing it from the other options provided.