Functions of blood

Our blood is very important. It keeps us alive. We explore some of its key functions.

Its role in the immune system

One of the key functions of blood is protection. Did you know that, when fighting an infection, the body produces more white blood cells?

Transport around the body

One of the key functions of blood is transport. Did you know it takes a red blood cell less than a minute to move from the heart, through the body, and back to the heart?

Clotting

One of the key functions of blood is clotting. Did you know that platelets are small, about one third of the size of a red blood cell?

Regulation

One of the key functions of blood is regulation. Did you know that small blood vessels in the lining of your nose are able to warm cold air to body temperature before it gets to the lungs?