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

Thin filaments are primarily composed of which protein?

Myosin

Tropomyosin

Troponin

Actin

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Verified step by step guidance

Understand the structure of muscle fibers: Muscle fibers are composed of myofibrils, which in turn are made up of repeating units called sarcomeres.

Identify the components of a sarcomere: Sarcomeres contain thick and thin filaments. The thick filaments are primarily composed of the protein myosin.

Focus on the thin filaments: Thin filaments are primarily composed of the protein actin. They also contain two other proteins, tropomyosin and troponin, which regulate the interaction between actin and myosin during muscle contraction.

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

Conclude with the correct answer: Based on the composition of the thin filaments, the primary protein is actin.