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The lymph serves to

1. transport oxygen to the brain.
2. transport carbon dioxide to the lungs.
3. return the interstitial fluid to the blood.
4. return the WBCs and RBCs to the lymph nodes.

Correct answer: return the interstitial fluid to the blood.

Solution

Lymph is formed from interstitial fluid that escapes from blood capillaries into tissues. The lymphatic system returns this excess fluid to the bloodstream, helping maintain fluid balance.

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