The heart. Think of it as a four chambered pump.
The heart cannot produce enough blood to circulate the body. Caused by smoking or drinking
The person will die if the blood does not circulate. Blood is necessary to supply food and oxygen to the body.
veins
blood
They circulate and oxygenate the blood.
ambot
circulate
YES
it needs to
Nope.
circulate blood
Circulate blood.