George Washington died after his physician treated his sore throat with bloodletting, but don't let that stop you from ...

Every day, your heart tirelessly pumps blood through your circulatory system, delivering oxygen and nutrients to your body's tissues while removing waste products. The circulatory system ...

the influential Roman physician Galen added that blood was continually formed by the liver and delivered to the organs like an irrigation system where it was subsequently consumed completely, with ...

Between 10 and 20 per cent of the Western adult population has high blood pressure. The sensation of pins and needles is caused by an impairment of blood circulation.

So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. Inside you, there is an amazing network of blood vessels, the tubes that carry ...

Veins between two capillary networks are portal systems. Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the ...

Your circulatory system is made up of three parts: the heart, blood vessels and the blood itself. Your heart keeps all the blood in your circulatory system flowing. The blood travels through a ...

This article was originally published with the title “ The Circulatory System of Plants ” in Scientific American Magazine Vol. 200 No. 2 (February 1959), p. 44 doi:10.1038 ...