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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

How do the H bands and I bands of the sarcomere differ?

The H band is found at the Z line, while the I band is found at the M line.

The H band contains only thick filaments, while the I band contains only thin filaments.

The H band contains both thick and thin filaments, while the I band contains only thick filaments.

The H band shortens during muscle contraction, while the I band remains the same length.

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the functional unit of a muscle fiber, composed of thick filaments (myosin) and thin filaments (actin). It is organized into distinct regions, including the H band, I band, A band, Z line, and M line.

Define the H band: The H band is the central region of the sarcomere that contains only thick filaments (myosin). It is located within the A band and does not overlap with thin filaments.

Define the I band: The I band is the region of the sarcomere that contains only thin filaments (actin). It spans the area between adjacent sarcomeres and is bisected by the Z line, which anchors the thin filaments.

Explain the changes during muscle contraction: During contraction, the sarcomere shortens as the thick and thin filaments slide past each other. The H band shortens because the overlap between thick and thin filaments increases, while the I band also shortens as the Z lines move closer together.

Compare the H band and I band: The H band contains only thick filaments and is located at the center of the sarcomere near the M line. The I band contains only thin filaments and is located at the edges of the sarcomere near the Z line. Both bands change length during muscle contraction.