Just breathe
People breathe this out
carbon dioxide
large, spongy organs in a person's chest
lungs
People breathe this in
oxygen
Hairs in the nose that clean the air coming in
cilia
What relationship does the circulatory system have with the respiratory system?
It provides oxygen throughout the body
Also known as windpipe
trachea
Bronchioles: trees
Lungs:____________
balloons
The voice box
larynx
Why do the number of lobes vary between the lungs?
One lung is smaller to make room for the heart
Bones that protect a person's lungs
ribs