From the aorta up through either the carotid arteries which supply the greater portion of the brain or the vertebral arteries which supply the poster/inferior portion of the brain.
I dnt know!!! SORRY......
It is oxygen poor when it goes in to the right atrium then ventricle then to the lungs. It comes back to the left atrium oxygen rich, it pumps to the left ventricle and...
vertebral arteries pass through foramen magnum and reach the inferior of the brain & unite to from the basilar artery. The vertebral artery supplies the posterior of the brain. Basilar atery branches...