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

Sliding Filament Theory and the Sacromere

Anatomy & Physiology

9. Muscle Tissue

Sliding Filament Theory and the Sacromere

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Multiple Choice

Which of the following events will not occur within the sarcomeres of a contracting muscle fiber?

The I band shortens.

The Z lines move closer together.

The A band shortens.

The H zone disappears.

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the basic unit of a muscle fiber and is composed of several bands and zones, including the A band, I band, H zone, and Z lines.

Identify the changes that occur during muscle contraction: During contraction, the sarcomere shortens, causing the I band to shorten, the Z lines to move closer together, and the H zone to disappear.

Analyze the A band: The A band is the region of the sarcomere that contains the entire length of the thick filaments. It remains the same length during contraction because the thick filaments do not change length.

Determine which event does not occur: Since the A band does not shorten during muscle contraction, this is the event that does not occur within the sarcomeres of a contracting muscle fiber.

Conclude the analysis: The correct answer is that the A band does not shorten during muscle contraction, while the other events listed do occur.