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

Introduction to Blood Vessels

Anatomy & Physiology

19. The Blood Vessels

Introduction to Blood Vessels

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Multiple Choice

Which of the following does not contribute to venous return?

Arterial pressure

Skeletal muscle pump

Respiratory pump

Venous valves

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Verified step by step guidance

Understand the concept of venous return: Venous return is the flow of blood back to the heart. It is influenced by several physiological mechanisms that help overcome the low pressure in veins compared to arteries.

Identify the mechanisms that contribute to venous return: These include the skeletal muscle pump, the respiratory pump, and venous valves. Each of these plays a role in facilitating the movement of blood towards the heart.

Explain the skeletal muscle pump: When skeletal muscles contract, they compress nearby veins, pushing blood through the veins and towards the heart. This is especially important in the limbs.

Describe the respiratory pump: During inhalation, the pressure in the thoracic cavity decreases, while abdominal pressure increases. This pressure gradient helps draw blood into the thoracic veins and towards the heart.

Clarify the role of venous valves: Venous valves prevent the backflow of blood, ensuring that it moves in one direction towards the heart. This is crucial in maintaining efficient venous return, especially in the extremities.