The circulatory system transports substances between the exchange surface and cells. It delivers oxygen and glucose to the tissues for respiration, which is the release of energy to cells.

Without oxygen: How primordial microbes breathed Scientists discover how the oldest enzyme of cellular respiration works -- potential applications in removing CO2 from exhaust gases Date: March 17 ...

Cells require ATP to power vital reactions ... suggest that a special form of respiration could have existed even then. These ...

Meet the low-cost standard for hypoxic and physioxic environment cell culture that enabled HIF-1α Nobel Prize-winning research. Lab safety rules dictate that one must tie back long hair. Rosemarie ...