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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Problem 1e

Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Veins have smaller lumens, more elastic fibers, and more smooth muscle than arteries.

Verified step by step guidance

Step 1: Understand the structural differences between veins and arteries. Veins and arteries are both blood vessels, but they have distinct structural features due to their different functions. Arteries carry blood away from the heart under high pressure, while veins return blood to the heart under lower pressure.

Step 2: Analyze the lumen size. Arteries generally have smaller lumens compared to veins because they need to maintain high pressure to transport blood efficiently. Veins have larger lumens to accommodate the lower pressure and larger volume of blood returning to the heart.

Step 3: Examine the presence of elastic fibers. Arteries contain more elastic fibers than veins because they need to withstand and adapt to the high pressure generated by the heart's pumping action. Veins have fewer elastic fibers as they operate under lower pressure.

Step 4: Assess the amount of smooth muscle. Arteries have more smooth muscle in their walls compared to veins. This smooth muscle helps regulate blood flow and pressure by constricting or dilating the vessel. Veins have less smooth muscle because they rely on valves and surrounding skeletal muscle contractions to move blood.

Step 5: Correct the false statement. The statement 'Veins have smaller lumens, more elastic fibers, and more smooth muscle than arteries' is false. The correct statement is: 'Veins have larger lumens, fewer elastic fibers, and less smooth muscle than arteries.'

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Structure of Blood Vessels

Blood vessels consist of arteries, veins, and capillaries, each with distinct structural features. Arteries have thicker walls with more elastic fibers and smooth muscle to withstand high pressure from the heart. In contrast, veins have thinner walls and larger lumens, which accommodate a greater volume of blood at lower pressure.

Function of Veins

Veins are responsible for returning deoxygenated blood to the heart. They contain valves that prevent backflow and help maintain blood flow against gravity, especially in the limbs. The lower pressure in veins compared to arteries necessitates their larger lumens to facilitate blood return.

Comparative Anatomy of Arteries and Veins

When comparing arteries and veins, it is essential to note that arteries have smaller lumens and are more muscular and elastic, allowing them to handle high-pressure blood flow. Conversely, veins have larger lumens, less smooth muscle, and fewer elastic fibers, which is crucial for their role in low-pressure blood return.