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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

General Blood Vessel Structure

Anatomy & Physiology

19. The Blood Vessels

General Blood Vessel Structure

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Multiple Choice

Which of the following statements is true?

The tunica media in veins is thicker than tunica media in arteries.

The tunica intima contains the endothelium, which lines the lumen of all blood vessels.

The walls of all blood vessels always have 3 distinct layers/tunics.

The tunica externa is mostly composed of smooth muscle that can contract, causing vasoconstriction.

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Verified step by step guidance

Understand the structure of blood vessel walls: Blood vessels have three layers known as tunics - the tunica intima, tunica media, and tunica externa.

Identify the components of each tunic: The tunica intima is the innermost layer and contains the endothelium, which lines the lumen of all blood vessels.

Compare the tunica media in arteries and veins: The tunica media is thicker in arteries than in veins, as arteries need to withstand higher pressure.

Clarify the composition of the tunica externa: The tunica externa is primarily composed of connective tissue, not smooth muscle. It provides structural support and protection.

Evaluate the statement about the number of layers: Not all blood vessels have three distinct layers; capillaries, for example, only have a tunica intima.