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 statements about H zones and I bands is true?

The I band shortens during muscle contraction while the H zone remains unchanged.

The H zone contains only thick filaments and is found in the center of the A band.

The H zone is the region where thick and thin filaments overlap.

The I band contains both thick and thin filaments and is found at the center of the sarcomere.

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Verified step by step guidance

Understand the structure of a sarcomere, which is the basic unit of a muscle's striated muscle tissue. It is composed of repeating sections of actin and myosin filaments.

Identify the I band, which is the region of the sarcomere that contains only thin filaments (actin) and is located on either side of the Z line. It appears lighter under a microscope.

Recognize the A band, which is the region that contains the entire length of the thick filaments (myosin) and overlaps with thin filaments. It appears darker under a microscope.

Focus on the H zone, which is a part of the A band where there are only thick filaments and no overlap with thin filaments. It is located in the center of the A band and appears as a lighter region within the A band.

Evaluate the given statements: The correct statement is that the H zone contains only thick filaments and is found in the center of the A band. This aligns with the structural understanding of the sarcomere.