As you read this sentence, trillions of cells are moving around in your body. From the red blood cells being ... under a pulsating "flow," mimicking how cells travel through a vessel.

only allows blood to pass through one cell at a time Other features Thick muscular walls to withstand blood flowing at high pressure as it leaves the heart; the largest artery is the aorta Contain ...

only allows blood to pass through one cell at a time Other features Thick muscular walls to withstand blood flowing at high pressure as it leaves the heart; the largest artery is the aorta Contain ...