Blood is a red fluid.
It is thicker than water and it feels sticky.
It appears red because of the large number of red blood cells.
The blood is a vitally important fluid for the body.
Blood gives the cells the oxygen (O2) and nutrients they need.
Blood also collects waste products like carbon dioxide (CO2).
Circulation
The circulatory system transports blood throughout the body.
Blood transports oxygen and other essential substances.
Source | chichin85
NATURAL SCIENCE #2 