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

Which of the following statements best describes smooth muscle cells?

They are multinucleated and have visible striations.

They are voluntary and attached to bones.

They are spindle-shaped and lack striations.

They are branched and connected by intercalated discs.

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Verified step by step guidance

Understand the characteristics of smooth muscle cells: Smooth muscle cells are specialized for involuntary movements and are found in the walls of hollow organs such as the intestines, blood vessels, and bladder.

Compare smooth muscle cells to other muscle types: Skeletal muscle cells are multinucleated, voluntary, and have visible striations. Cardiac muscle cells are branched, striated, and connected by intercalated discs. Smooth muscle cells differ from both skeletal and cardiac muscle cells in structure and function.

Focus on the structural features of smooth muscle cells: Smooth muscle cells are spindle-shaped (elongated with tapered ends) and lack visible striations under a microscope. This is due to the arrangement of actin and myosin filaments, which are not organized into sarcomeres as in skeletal and cardiac muscles.

Eliminate incorrect options: The options describing multinucleated cells with striations, voluntary muscles attached to bones, and branched cells with intercalated discs do not match the characteristics of smooth muscle cells.

Select the correct description: The correct statement is 'They are spindle-shaped and lack striations,' which accurately describes the unique structure and appearance of smooth muscle cells.