Tissue fluid is made up of plasma and white blood cells. It acts as a bridge in the diffusion of chemicals between the capillaries and the cells of the tissue.

Oxygen and glucose diffuse from the blood into the tissue fluid and then into the cells.
Carbon dioxide and urea diffuse from the cells into the tissue fluid and then into the blood.

When the the tissue fluid drains into the lymphatic vessels, it is then called lymph. The lymph enters the blood again through the subclavian vein.

On its way from the tissues to the subclavian vein, lymph flows through several lymph nodes. This is where new white blood cells are produced, which destroy most bacteria/toxins in the lymph.

	Created by Zoe CB over 8 years ago

GCSE Biology (09: Transport in animals) Slide Set on Blood and lymphatic vessels, created by Zoe CB on 30/04/2016.