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 statements is FALSE?

During contraction, the distance between Z discs of a sarcomere decreases.

During contraction, thin filaments slide past thick filaments so that actin and myosin filaments do not overlap.

During contraction, actin-myosin cross bridges form.

During contraction, thin filaments slide past thick filaments so that actin and myosin filaments overlap.

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, consisting of thick (myosin) and thin (actin) filaments. The Z discs are the boundaries of each sarcomere.

Review the sliding filament theory: During muscle contraction, thin filaments (actin) slide past thick filaments (myosin), causing the sarcomere to shorten and the muscle to contract.

Identify the role of cross bridges: Actin-myosin cross bridges form when myosin heads bind to actin filaments, pulling them closer and facilitating the sliding motion.

Analyze the statement about filament overlap: During contraction, the thin and thick filaments do overlap as the actin filaments slide past the myosin filaments, which is a key aspect of the sliding filament theory.

Determine the false statement: The statement 'During contraction, thin filaments slide past thick filaments so that actin and myosin filaments do not overlap' is false because, in reality, the filaments do overlap during contraction.