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

Veins

Anatomy & Physiology

19. The Blood Vessels

Veins

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Multiple Choice

Which characteristic best applies to the structure of veins?

Veins contain valves to prevent backflow of blood.

Veins have thick muscular walls to withstand high pressure.

Veins have a narrow lumen compared to arteries.

Veins carry oxygen-rich blood away from the heart.

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Verified step by step guidance

Understand the primary function of veins in the circulatory system, which is to return deoxygenated blood back to the heart from various parts of the body.

Recognize that veins operate under lower pressure compared to arteries, which carry blood away from the heart under high pressure.

Identify that veins have a larger lumen compared to arteries, which helps accommodate the lower pressure and larger volume of blood returning to the heart.

Learn that veins contain valves, which are crucial for preventing the backflow of blood, especially in the limbs, where blood must travel against gravity to return to the heart.

Clarify that veins do not carry oxygen-rich blood away from the heart; this is a characteristic of arteries, specifically the pulmonary veins, which are an exception as they carry oxygenated blood from the lungs to the heart.