Discover the warning signs of circulatory problems, from buttock pain to slow-healing wounds, plus the foods and activities ...

Watch nutrients flow through an underground circulatory system that connects fungi and plants. A new study shows how these networks form.

Circulatory system: Blood vessels Laid end-to-end, an adult's arteries, veins and capillaries would stretch for about 100,000 miles - enough to wrap around the world nearly four times.

A bioreactor that mimics a circulatory system can deliver nutrients and oxygen to artificial tissue, enabling the production of over 10 grams of chicken muscle for cultured meat applications.