Air sacs need a rich supply of blood vessels to facilitate diffusion. A large number increases the surface area available to pick up oxygen and get rid of CO2.
They need a lot of blood.
breathe
Arteries usually carry O2 rich blood. Veins usually don't.
The pulmonary veins carry O2 rich blood to the heart.
The pulmonary veins carry oxygen rich blood from the lungs to the heart.
Yes, an artery is a type of blood vessel that carries oxygen-rich blood away from the heart to the rest of the body.
The blood vessel that carries oxygenated blood away from the heart to the body is the aorta. It is the largest artery in the body, originating from the left ventricle of the heart. The aorta branches into smaller arteries that supply oxygen-rich blood to various organs and tissues throughout the body.
The pulmonary vein carries blood from the lungs to the left atrium of the heart. The coronary arteries supply blood to the heart muscles. The Inferior and Superior Vena Cava bring the used blood from the body to the heart.
yes
The umbilical vein carries oxygen-rich blood from the placenta to the fetus, making it the fetal blood vessel with the highest oxygen concentration.
Vena Cava
An artery is a type of blood vessel that carries oxygen-rich blood away from the heart, while a blood vessel is a general term for any tube-like structure that transports blood throughout the body, including arteries, veins, and capillaries.