Circulatory System

The human circulatory system is responsible for the flow of the blood around the body the blood carries out a huge range of functions including supplying oxygen to the brain and muscles, transporting energy (blood sugar) and removing waste.

The circulatory system includes: Heart; Arteries; Veins; Capillaries; and Blood.

On its journey out from the heart, the blood travels from the left ventricle into the aorta, carrying oxygen throughout the body via the arteries.

The return journey is through the veins. As it passes through the lungs, the accumulated carbon dioxide is removed from the blood and replaced with fresh oxygen.

Arteries Our arteries are an essential part of the cardiopulmonary system. » Find out more...	Blood Our blood plays a vital role in transporting oxygen and nutrients to our tissues. » Find out more...
Capillaries The tiny capillaries are vital in transporting oxygen and nutrients into the cells of the body. » Find out more...	The heart A metaphor for many things, the heart is the ever-beating centre of the human system. » Find out more...
Veins Our veins play a vital role, transporting transport waste-rich blood back to the lungs and heart. » Find out more...