How can we help?

You can also find more resources in our Help Center.

Respiratory System

STUDY
PLAY
Pharynx
The throat (shared with the digestive system)
Trachea
Windpipe; passage though which air moves in the respiratory system.
Bronchi
The passageways that branch from the trachea and direct air into the lungs.
Lungs
The main organs of the respiratory system.
Diaphragm
A large, dome-shaped muscle that plays an important role in breathing.
Alveoli
Tiny sacs of lung tissue where gas exchange occurs.
Larynx
The voice box; located in the top part of the trachea, underneath the epiglottis.
Vocal Cords
Folds of connective tissue that stretch across the opening of the larynx and produce a person's voice.
Cilia
Tiny hair-like extensions of cells that can move together like whips.
Respiration
The process in which oxygen and glucose undergo a complex series of chemical reactions inside cells.