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 actions causes lymph to flow through the lymphatic vessels?

Secretion of digestive enzymes

Pumping action of the heart

Active transport by lymphocytes

Contraction of surrounding skeletal muscles

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Verified step by step guidance

Understand the function of the lymphatic system: The lymphatic system is responsible for transporting lymph, a fluid containing white blood cells, throughout the body. Unlike the circulatory system, the lymphatic system does not have a central pump like the heart.

Recognize the mechanisms that drive lymph flow: Lymph moves through lymphatic vessels primarily due to external forces, such as the contraction of surrounding skeletal muscles, pressure changes during breathing, and the presence of one-way valves in the vessels to prevent backflow.

Eliminate incorrect options: Secretion of digestive enzymes is unrelated to lymph flow, as it pertains to the digestive system. The pumping action of the heart drives blood circulation, not lymph flow. Active transport by lymphocytes refers to cellular processes, not the physical movement of lymph.

Focus on the correct mechanism: The contraction of surrounding skeletal muscles compresses the lymphatic vessels, pushing lymph forward. This process is known as the 'skeletal muscle pump.'

Conclude the reasoning: The correct answer is 'Contraction of surrounding skeletal muscles,' as this is the primary mechanism that causes lymph to flow through the lymphatic vessels.