The primary function of the lymphatic system is transporting excess interstitial fluid back to the blood, which is crucial for maintaining fluid balance. It also plays an important role in immune function by filtering lymph through lymph nodes. Therefore, option A is the correct answer. ;
The primary function of the lymphatic system is to transport excess interstitial fluid back to the blood, helping maintain fluid balance in the body. This process is essential for preventing swelling and ensuring proper immune function. Therefore, the correct answer is option A.
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