The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

Found near every living cell of the body. Microscopic – walls are one cell thick, this allows for the diffusion of substances into the cells from the capillaries and out of the cells into the ...

Watch nutrients flow through an underground circulatory system that connects fungi and plants. A new study shows how these ...

Red blood cells also get stuck in the mesh, forming a clot. This develops into a scab, which protects the wound as it heals. Plasma close blood plasmaThe liquid part of the blood containing useful ...