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epiglottis

inhalation

bronchi

trachea

alveolus

Sinus

cilia

bronchioles

expiration

diaphragm

muscle separating the chest and the abdomen

windpipe

Air-filled cavity that provides resonance for voice

thin hairs attached to the mucus membrane epithelium lining the respiratory tract

lid-like piece of cartilage covering the larynx

branches of the trachea leading into lungs

the act of breathing air out

air sacs in the lungs

small branches of the tubes leading into the lungs

the act of breathing air in