They travel upwards to the heart to get more carbon dioxide then they go down again.. I think.
The heart is divided into four compartments. The two upper portions where blood enters the heart from the body and lungs are the atria. Deoxygenated blood enters the right atrium, and oxygenated blood from the lungs enter the left atrium.
inferior vena cava
When the blood is going to the heart it is blue. When it is going away from the heart, it is red.
De-oxygenated blood is dark red. Oxygenated blood is bright red. Both enter the heart- the former enters the right heart; the latter enters the left heart.
heart
heart
relating to the force if the blood going through the heart?
Veins carry deoxygenated blood back the heart.
what color is blood goging to the heart
the heart pumps to the brain to keep it going
Depleted blood enters and leaves the right side of the heart.
Actually it is the Left Atrium