II. After inhaling fresh air, the 1. ________filter the air and get the oxygen through their air sacs. 2. ________ collect the oxygen and lead them to the 3. ________via pulmonary veins. Blood rich in 4. ________ will be pumped to all parts of the body so that every living cell can get enough of it to function normally.

lungs heart blood oxygen


Sagot :

Answer:

1. Lungs

2. Blood

3. Heart

4. oxygen