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

19. The Blood Vessels

Introduction to Blood Vessels

Anatomy & Physiology

19. The Blood Vessels

Introduction to Blood Vessels

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Multiple Choice

Which type of blood vessel has the thickest tunica media?

Venules

Arteries

Veins

Capillaries

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Verified step by step guidance

Understand the structure of blood vessels: Blood vessels are composed of three layers—tunica intima (inner layer), tunica media (middle layer), and tunica externa (outer layer). The tunica media is primarily made of smooth muscle and elastic fibers, which allow the vessel to regulate its diameter.

Compare the tunica media across different types of blood vessels: Arteries, veins, capillaries, and venules have varying thicknesses of the tunica media. Arteries have a thick tunica media to withstand high pressure and regulate blood flow, while veins have a thinner tunica media as they operate under lower pressure. Capillaries lack a tunica media entirely, as they are designed for exchange rather than regulation.

Focus on arteries: Arteries have the thickest tunica media because they need to handle the high pressure of blood being pumped from the heart and maintain elasticity for proper blood flow. The smooth muscle in the tunica media allows arteries to constrict and dilate as needed.

Eliminate incorrect options: Venules and veins have thinner tunica media layers compared to arteries, as they do not need to withstand high pressure. Capillaries lack a tunica media altogether, as their primary function is nutrient and gas exchange.

Conclude based on anatomical structure: The thickest tunica media is found in arteries, which is essential for their role in maintaining blood pressure and regulating blood flow.