Lungs

Smoking does damage your lungs.

Smoking has affected his lungs.

Everybody sang at the top of their lungs.

Smog is the enemy of healthy lungs.

Parks are to the city what lungs are to the animal.

Oxygen is taken into our lungs when we breathe.

The brain was not like the liver or the lungs.

Leaves are to plants what lungs are to animals.

Incidentally, that the gills of fish are bright red is because there are many 'capillary vessels' collected there, the same as for lungs.

She was born with underdeveloped lungs, but eventually a few steroid shots set her straight.