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

Types of Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Types of Muscle Tissue

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Multiple Choice

In striated muscle tissue, what process is occurring in the dark bands known as A bands?

Actin and myosin filaments overlap

Only actin filaments are present

Only myosin filaments are present

The sarcoplasmic reticulum stores calcium

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Verified step by step guidance

Understand the structure of striated muscle tissue, which includes repeating units called sarcomeres. Each sarcomere is bordered by Z lines and contains A bands and I bands.

Recognize that A bands are the dark bands in the sarcomere. They are characterized by the presence of thick filaments, primarily composed of the protein myosin.

Identify that within the A band, there is an overlap of thick myosin filaments and thin actin filaments. This overlap is crucial for muscle contraction.

Recall that the presence of both actin and myosin filaments in the A band allows for the sliding filament mechanism, where these filaments slide past each other to shorten the sarcomere during contraction.

Note that the sarcoplasmic reticulum, which stores calcium ions, is not directly involved in the structure of the A band but plays a role in regulating muscle contraction by releasing calcium ions.