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

In this figure of a sarcomere, which structure corresponds to the region where only thick filaments are present?

Z disc

A band

I band

H zone

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Verified step by step guidance

Step 1: Begin by understanding the structure of a sarcomere, which is the functional unit of a muscle fiber. It is composed of repeating units of thick and thin filaments organized in a specific pattern.

Step 2: Identify the components of the sarcomere. The Z disc marks the boundary of each sarcomere, the A band contains the entire length of thick filaments, and the I band contains only thin filaments. The H zone is the region within the A band where only thick filaments are present.

Step 3: Recall that thick filaments are composed of myosin, while thin filaments are composed of actin. The overlap of these filaments creates the striated appearance of skeletal muscle.

Step 4: Examine the H zone specifically. It is located in the center of the A band and is devoid of thin filaments, making it the region where only thick filaments are present.

Step 5: To confirm the answer, compare the definitions of the Z disc, A band, I band, and H zone. The H zone is the correct answer because it matches the description of the region containing only thick filaments.