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

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which of the following proteins are found within a sarcomere?

Collagen

Actin

Keratin

Elastin

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the functional unit of a muscle fiber, responsible for contraction. It contains specific proteins that interact to facilitate this process.

Identify the key proteins involved in muscle contraction within the sarcomere: The primary proteins are actin (thin filaments) and myosin (thick filaments). Other associated proteins include tropomyosin and troponin, which regulate the interaction between actin and myosin.

Review the given options: Collagen, Keratin, Elastin, and Actin. Collagen is a structural protein found in connective tissues, not in the sarcomere. Keratin is a protein found in hair, nails, and skin, not in muscle tissue. Elastin is a protein that provides elasticity to tissues like skin and blood vessels, but it is not part of the sarcomere.

Focus on Actin: Actin is a key protein within the sarcomere. It forms the thin filaments that interact with myosin during muscle contraction. This interaction is essential for the sliding filament mechanism of muscle contraction.

Conclude that Actin is the correct answer: Based on the structure and function of the sarcomere, Actin is the only protein listed that is found within the sarcomere and plays a direct role in muscle contraction.