Get up close and personal with blood — the key to your body’s oxygen transport and immunity — with five peeks inside your veins, featuring molecules seen at thousands of times their actual size.
A human has about a gallon to a gallon-and-a-half of blood coursing through their veins at any given time. It’s made up of four components: red blood cells, white blood cells, platelets, and plasma. Together, they provide oxygen, immunity, and the critical ability to clot, so all that precious life-sustaining matter doesn’t trickle out.
Take a visual journey inside the veins in the photo gallery below.