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

What protein primarily composes the thin filaments in the sarcomere according to the sliding filament theory?

Actin

Tropomyosin

Troponin

Myosin

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Verified step by step guidance

Understand the structure of the sarcomere: The sarcomere is the basic contractile unit of muscle fiber, composed of thick and thin filaments.

Identify the components of the thin filament: The thin filament is primarily composed of three proteins: actin, tropomyosin, and troponin.

Focus on the primary protein: Among the proteins in the thin filament, actin is the most abundant and forms the backbone of the thin filament structure.

Differentiate between the roles of the proteins: Actin provides the structural framework, while tropomyosin and troponin regulate the interaction between actin and myosin during muscle contraction.

Relate to the sliding filament theory: According to the sliding filament theory, actin (thin filament) and myosin (thick filament) interact to produce muscle contraction, with actin being the primary protein in the thin filament.