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 Heart2h 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

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

Which of the following allows recoil of the muscle fiber when contraction ends?

troponin

elastic filaments

myosin

actin

tropomyosin

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Verified step by step guidance

Understand the role of elastic filaments in muscle contraction. Elastic filaments, primarily composed of the protein titin, are responsible for maintaining the structural integrity of the sarcomere and allowing the muscle fiber to return to its resting length after contraction.

Review the structure of a sarcomere, the functional unit of a muscle fiber. The sarcomere is composed of thick filaments (myosin), thin filaments (actin), and elastic filaments (titin).

Consider the function of titin, which is the main component of elastic filaments. Titin acts as a molecular spring, providing passive elasticity to the muscle fiber and helping it recoil after contraction.

Differentiate between the roles of other proteins listed: Troponin and tropomyosin are regulatory proteins involved in muscle contraction, while myosin and actin are contractile proteins that interact to produce muscle contraction.

Conclude that elastic filaments, due to the presence of titin, are responsible for the recoil of the muscle fiber when contraction ends, allowing the muscle to return to its original length.