What provides the human brain with oxygen and nourishment?

Answer

The carotid artery provides the brain with the blood that carries the blood and oxygen.

http://www.answers.com/topic/common-carotid-artery-1

Blood provides the brain and all of our other organs with the oxygen and nourishment it needs. Blood is kind of like the body's highway, it gets everything where it needs to go.

When our heart beats blood is sent to the lungs, then when we breath the red blood cells absorb oxygen, then when our heart beats again the blood is sent around out body like to our arms, legs and brain etc etc. This oxygen is then passed to the different lims and organs.

Then the cycle starts again.