Final answer:
The lymphatic system functions to maintain fluid balance in the body, support the immune system by transporting and filtering lymph, and assist in the absorption of fats and fat-soluble vitamins from the digestive tract.
Step-by-step explanation:
Three Functions of the Lymphatic System
The lymphatic system has several important functions within the body. Primarily, it serves to maintain fluid balance, protect the body from infection and disease, and assist in the absorption of dietary fats.
Fluid Balance
One of the critical roles of the lymphatic system is the regulation of fluid balance. It returns excess interstitial fluid, which accumulates due to blood pressure and capillary filtration, back to the bloodstream. Without this system, fluid would build up in tissues leading to swelling, known as lymphedema.
Immune System Support
The lymphatic system is integral to the immune system. It transports lymphocytes, specific types of white blood cells that are essential for defending the body against foreign invaders, such as bacteria, viruses, and cancer cells. Lymph nodes act as filters, trapping and destroying pathogens to prevent infections.
Absorption of Fats
Another key function of the lymphatic system is the absorption and transport of fats and fat-soluble vitamins from the digestive tract. Lacteals, specialized lymphatic vessels in the small intestine, absorb these nutrients from digested food and transport them to the bloodstream.