The Respiratory System (copy)

trachea

carries air from the mouth to the lungs

ribs

protect the lungs

intercoastal muscles

expand and contract during breathing

alveolus

location of gas exchange

diaphragm

layer of muscle, expands and contracts during breathing

bronchioles

small branches of the bronchus carry air to the alveoli

bronchi

one bronchus carries air into each lung

lung

organ of gas exchange

epiglottis

covers the trachea when swallowing

nose

air is warmed and moistened when it enters

c-shaped rings of cartilage

hold the trachea open