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

How is lymph fluid circulated through the body?

By the contraction of skeletal muscles and movement of the body

By the pumping action of the heart

By cilia lining the lymphatic vessels

By active transport across lymphatic vessel walls

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Verified step by step guidance

Understand the role of the lymphatic system: The lymphatic system is responsible for transporting lymph fluid, which contains white blood cells, proteins, and waste products, throughout the body. It does not have a central pump like the heart, so circulation relies on other mechanisms.

Eliminate incorrect options: The heart does not pump lymph fluid directly, as it is part of the cardiovascular system, not the lymphatic system. Similarly, cilia are not present in lymphatic vessels, so this option can also be ruled out.

Focus on the correct mechanisms: Lymph fluid is circulated primarily by the contraction of skeletal muscles during body movement. These contractions compress the lymphatic vessels, pushing the fluid forward. Additionally, one-way valves in the vessels prevent backflow.

Consider the role of pressure changes: Breathing and other body movements create pressure changes in the thoracic cavity, which also help propel lymph fluid through the vessels.

Summarize the correct answer: The circulation of lymph fluid is achieved through the contraction of skeletal muscles and body movement, not by active transport or cilia lining the vessels.