What does the lymphatic system primarily transport?

The lymphatic system primarily transports tissue fluid and wastes, making it essential for maintaining fluid balance and supporting the immune system. This system collects excess interstitial fluid from tissues, which can include proteins, cell debris, and other waste products, and returns it to the bloodstream. By doing so, it helps prevent edema (swelling from excess fluid) and supports the body's waste removal processes.

Additionally, the lymphatic system plays a crucial role in transporting immune cells and filtering harmful substances through lymph nodes, where the immune response can be initiated. It's this function of managing and moving tissue fluid, along with waste products that defines the primary role of the lymphatic system, setting it apart from systems that transport oxygen, nutrients, or electric signals.