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

Types of Blood Vessels

Anatomy & Physiology

19. The Blood Vessels

Types of Blood Vessels

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Multiple Choice

Which blood vessels lack elastic tissue?

Capillaries

Arteries

Arterioles

Veins

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Verified step by step guidance

Understand the structure of blood vessels: Blood vessels are composed of three layers - the tunica intima, tunica media, and tunica externa. The presence of elastic tissue varies among different types of blood vessels.

Identify the role of elastic tissue: Elastic tissue in blood vessels allows them to stretch and recoil, which is crucial for maintaining blood pressure and accommodating the surge of blood from the heart.

Examine the structure of capillaries: Capillaries are the smallest blood vessels and are primarily composed of a single layer of endothelial cells. They lack the tunica media and tunica externa, and therefore, do not contain elastic tissue.

Compare with other blood vessels: Arteries and arterioles have a significant amount of elastic tissue in their walls, especially in the tunica media, to withstand and regulate the high pressure of blood pumped from the heart. Veins have less elastic tissue compared to arteries but still contain some to help return blood to the heart.

Conclude which vessels lack elastic tissue: Based on the structural differences, capillaries are the blood vessels that lack elastic tissue, as they are designed for the exchange of nutrients and gases rather than withstanding high pressure.