Question

name these little sacs are where carbon dioxide leaves the blood and oxygen enter it ​

Answer 1

Answer:

A protein called haemoglobin in the red blood cells then carries the oxygen around your body. At the same time, carbon dioxide that is dissolved in the blood comes out of the capillaries back into the air sacs, ready to be breathed out. ... Blood without oxygen returns through the veins, to the right side of your heart.