Table of contents

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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

What is the area in the center of the A band where there are no actin myofilaments?

I band

M line

H zone

Z line

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Begin by understanding the structure of a sarcomere, which is the functional unit of a muscle fiber. It is composed of repeating units between two Z lines.

Identify the A band within the sarcomere. The A band is the region that contains the entire length of the thick filaments, primarily composed of myosin.

Recognize that within the A band, there is a central region where there are no thin filaments (actin). This area is known as the H zone.

Understand that the H zone is characterized by the absence of actin filaments, making it distinct from other regions like the I band, which contains only actin filaments.

Note that the M line is located in the center of the H zone and serves as an attachment site for the thick filaments, but it does not define the area where actin is absent.