Page 11 - PPT1

2. GILLS

 Most aquatic animals GILLS

such as fish and crabs

use gills for breathing.

 A tadpole also breaths

through gills.

 Gills are thin organs

that have a rich supply

of blood vessels.

 When water

containing oxygen

passes over the gills,

they absorb oxygen

from the water and

release carbon

dioxide from the

blood.