Multiple choice

The lymph serves to

  1. transport CO2 to the lungs

  2. transport O2 to the brain

  3. return the interstitial fluid to the blood

  4. return the WBCs and RBCs to the lymph nodes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lymphatic vessels collect interstitial fluid (fluid that leaks out of blood capillaries into tissue spaces) and return it to the bloodstream via the thoracic duct and right lymphatic duct. Lymph does not transport CO2 or O2 - those functions are performed by blood. Lymph nodes contain lymphocytes, not RBCs.

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