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Most of the lymph returns to the venous circulation by way of the:
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20. The Lymphatic System
Introduction to the Lymphatic System
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Which of the following is the difference between interstitial fluid and lymph?
A
Lymph originates in lymphatic vessels, while interstitial fluid originates in arterioles.
B
Lymph is the term given to interstitial fluid once it has entered the lymphatic vessels.
C
Lymph contains erythrocytes, while interstitial fluid does not contain erythrocytes.
D
Lymph contains leukocytes, while interstitial fluid does not contain leukocytes.
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Understand the definitions: Interstitial fluid is the fluid that surrounds the cells in tissues, providing them with nutrients and a means of waste removal. Lymph is the fluid that circulates within the lymphatic system, which is derived from interstitial fluid.
Identify the process of fluid movement: Interstitial fluid is formed when blood plasma exits the capillaries and enters the tissue spaces. This fluid bathes the cells and eventually drains into the lymphatic vessels, becoming lymph.
Recognize the composition differences: Interstitial fluid and lymph are similar in composition, but lymph may contain additional components such as lymphocytes (a type of leukocyte) as it travels through the lymphatic system.
Clarify the role of lymphatic vessels: Lymphatic vessels collect interstitial fluid from tissues, filter it through lymph nodes, and return it to the bloodstream. This process helps maintain fluid balance and plays a role in immune function.
Evaluate the given options: The correct distinction is that lymph is the term given to interstitial fluid once it has entered the lymphatic vessels. This highlights the transition from interstitial fluid to lymph as it enters the lymphatic system.
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