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

20. The Lymphatic System

Introduction to the Lymphatic System

Anatomy & Physiology

20. The Lymphatic System

Introduction to the Lymphatic System

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Multiple Choice

Which of the following promotes closure of the minivalves associated with lymph capillaries?

Decreased pressure in the interstitial fluid

Contraction of surrounding skeletal muscles

Increased pressure in the interstitial fluid

Increased pressure inside the lymphatic capillary

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Verified step by step guidance

Understand the structure and function of lymph capillaries: Lymph capillaries are small, thin-walled vessels that collect excess interstitial fluid and transport it to larger lymphatic vessels. They have unique minivalves that open and close based on pressure differences between the interstitial fluid and the lymphatic capillary.

Learn the mechanism of minivalve operation: Minivalves are flap-like structures that allow fluid to enter the lymph capillaries when the pressure in the interstitial fluid is higher than the pressure inside the lymphatic capillary. Conversely, they close when the pressure inside the lymphatic capillary exceeds the pressure in the interstitial fluid, preventing backflow.

Analyze the pressure dynamics: Decreased pressure in the interstitial fluid would reduce the driving force for fluid entry into the lymph capillaries, but it would not directly promote closure of the minivalves. Increased pressure in the interstitial fluid would open the minivalves, allowing fluid to enter the lymph capillaries.

Consider the role of skeletal muscle contraction: Contraction of surrounding skeletal muscles helps propel lymph through the lymphatic vessels, but it does not directly affect the closure of the minivalves.

Conclude the correct mechanism: Increased pressure inside the lymphatic capillary promotes closure of the minivalves by creating a pressure gradient that prevents fluid from flowing back into the interstitial space.