Breathing

Objectives

• Parts of the lungs

• How and why we inhale and exhale

• How gas exchange works

• How lungs can be damaged

The Lungs

diaphragm

abdomen

thorax

tracheabronchus

alveolibronchiole

lung

rib muscles

ribs

Inhaling

The diaphragm moves down

Ribs move up and out

Exhaling

The diaphragm moves up

Ribs move down and in

Gas Exchangeof oxygen and carbon dioxide

Damage caused by smoking