heart
The cornea is the only organ in the human body that does not have a direct blood supply. It receives nutrients and oxygen from tears and the aqueous humor that surrounds it.
The heart is the organ that receives blood from the veins and pumps it into the arteries.
The embryo receives oxygen via the mother's bloodstream through the placenta. This organ provides a direct connection between the mother and the developing fetus, allowing for the exchange of oxygen and nutrients. Oxygen from the mother's red blood cells diffuses across the placental barrier and enters the fetal blood circulation.
The right atrium of the heart receives oxygen-poor blood from the body.
heart
Blood
The left atrium receives oxygen-rich blood.
The nearest organ to the heart that receives oxygenated blood is the lungs. After blood is oxygenated in the lungs, it returns to the heart via the pulmonary veins. From there, the heart pumps this oxygen-rich blood to the rest of the body, including vital organs and tissues.
That is the Heart.
heart
The pulmonary arteries carry deoxygenated blood to the lungs.
The brain consumes 40% of the oxygen in your blood.