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diaphragm

epiglottis

alveolus

Sinus

inhalation

cilia

expiration

bronchioles

bronchi

trachea

lid-like piece of cartilage covering the larynx

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

windpipe

the act of breathing air out

muscle separating the chest and the abdomen

branches of the trachea leading into lungs

air sacs in the lungs

Air-filled cavity that provides resonance for voice

small branches of the tubes leading into the lungs

the act of breathing air in