SCIENCE
JOURNEY THROUGH YOUR BLOOD VESSELS
Dive under the surface and discover the expanse of arteries, veins and capillaries that keep our cells energised and healthy
WORDS JAMES HORTON
DID YOU KNOW? White blood cells make up just one per cent of blood
Every cell in the human body requires oxygen to produce energy, but most of our cells cannot access it directly.
A single-celled life form interacts directly with its environment, exchanging nutrients and waste products as required. But our ancestors gave up that lifestyle hundreds of millions of years ago when they evolved to become multicellular.
As multicellular life grew more sophisticated, our ancestors’ cells became specialised and compartmentalised. Then, many millions of years later, their descendants migrated from the ocean to the land. Gone were the days when even external cells exchanged nutrients with their environment – now our ancestors’ cells