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 definition best describes veins?

Veins are blood vessels that exchange nutrients and waste products with tissues.

Veins are blood vessels that regulate blood pressure by constricting and dilating.

Veins are blood vessels that carry blood towards the heart.

Veins are blood vessels that carry blood away from the heart.

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Verified step by step guidance

Understand the primary function of veins in the circulatory system. Veins are responsible for carrying blood back to the heart from various parts of the body.

Differentiate between veins and arteries. Arteries carry blood away from the heart, while veins carry blood towards the heart.

Consider the structural features of veins, such as the presence of valves that prevent backflow and assist in returning blood to the heart, especially from the lower parts of the body.

Recognize that veins are part of the systemic and pulmonary circuits, where systemic veins return deoxygenated blood to the heart, and pulmonary veins carry oxygenated blood from the lungs to the heart.

Identify the correct definition based on the function and characteristics of veins: 'Veins are blood vessels that carry blood towards the heart.'