Dictionary Home »
Images » gill images
gill images
gill
Fish breathe by swallowing water, and passing it through gill slits on each side of their head. Blood-filled filaments on the gills extract oxygen from the water as it flows through.
The American Heritage® Science Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
More gill images
Learn more about gill