What is the primary purpose of lymphatic vessels in the body?

The primary purpose of lymphatic vessels is to drain excess fluids from tissues, which is critical for maintaining fluid balance within the body. The lymphatic system helps collect interstitial fluid, which is the fluid that exists between cells, and transport it back into the bloodstream. This process not only prevents edema (swelling caused by excess fluid) but also plays an essential role in the immune system by facilitating the movement of immune cells and pathogens from tissues to lymph nodes, where they can be filtered and attacked by immune responses.

This function of draining excess fluids helps to maintain homeostasis, ensuring that tissues do not become overwhelmed with fluid, which could lead to various health issues. The lymphatic vessels also play a role in nutrient absorption, particularly the absorption of fats and fat-soluble vitamins from the digestive system, but their main function is fluid drainage.