What system returns excessive tissue fluid to venous circulation?

The lymphatic system plays a crucial role in returning excessive tissue fluid, also known as interstitial fluid, back to the venous circulation. This system is essential for maintaining fluid homeostasis within the body. The lymphatic vessels collect this excess fluid that accumulates in the tissues due to various physiological processes and transport it through a network of vessels, ultimately draining it into the bloodstream at specific points where it enters the venous circulation.

This process not only helps to balance fluid levels but also aids in the immune response by transporting lymph, which contains immune cells and can help in the removal of pathogens from tissue spaces. The action of the lymphatic system is pivotal, as without it, tissues could become edematous, causing swelling and potentially leading to other health issues. Thus, the lymphatic system is specifically designed for the efficient drainage and return of tissue fluids to maintain overall fluid balance in the body.