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What is the trachea?
This tube carries air from the throat to the lungs.
Shared pathway for food and air.
pharynx
most abundant gas
Nitrogen
Organ beside left lung.
heart
What are the lungs?
Two spongy organs protected by the rib cage.
Tiny air sacs where gas exchange occurs.
alveoli
Sticky substance trapping germs.
mucus
Hair-like structures moving mucus.
cilia
Muscle under the lungs used for breathing.
diaphragm
What are vocal cords?
These vibrate to make sound.
Increases oxygen intake.
yawning
System protected by mucus + cilia.
respiratory system
What is the nasal cavity?
Warms, moistens, filters air.
Voice box.
larynx
Clears irritants from nose.
sneezing
#% of oxygen in air is?
21%
What is the epiglottis?
Flap that blocks food from airway.
Food entering this and causes choking.
trachea
What is the medulla oblongata?
Controls sneezing reflex
This tissue lines the trachea and contains specialized goblet cells that produce mucus, while tiny hair-like structures sweep it upward.
ciliated epithelium