Blood that is rich in oxygen appears red. Blood that is poor in oxygen appears blue.
Arteries are tough, elastic tubes that carry blood away from the heart. Veins carry the blood to the heart.
bright red
Blood leaves the pulmonary artery and travels into the lungs. In the lungs the blood releases carbon dioxide and picks up oxygen.
Lungs contain lots of blood. Blood goes to the lungs to pick up oxygen.
blue
artery
...to the lungs.
To the lungs.
fun
Carbon dioxide.
Carbon Dioxide.
The lungs are an exchange point where CO2 leaves and O2 enters the blood
Deoxygenated blood goes to the lungs to get rid of carbon dioxide and to pick up oxygen.
The lungs