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the throat


voicebox. sits above trachea

Vocal Chords

pair of elastic ligaments on either side of the larynx wall. air forced between them causes chords to vibrate=sound.


gap between vocal chords that opens to larynx

Bronchi (Bronchus)

tubelike branchings of the trachea that lead to lungs


Condition where mucus accumulates airways and particles get trapped.


cone shaped organs seperated from eachother by the heart

left lung has__ lobes


Right lung has __ lobes


Intercostal Muscles

muscle between the ribs which help ribs move when lungs expand/contract


thin sheet of muscle that divides the thoracic and abdominal cavaties, rests against lower lungs and aids in inhaling/exhaling


thin double membrane sacs with fluid between layers. encloses the lungs.


bronchi narrow and branch off forming "trees". inside each lung, narrow branching pathways.

Alveoli (Alveolus)

tiny air sacs. gas exhanged by diffusion here through blood capillaries. Millions of Alveoli in each lung.


when refeering to the respiratory system. process that delivers oxygen to cells of body and removes carbon dioxide waste.

Respiratory Surface

a thin, moist epithelium. gases must cross it to enter/leave the body. gases must be dissolved in fluid to get across


breathin in


breath out

Respiratory Cycle

one inhalation + one expiration= one respiratory cycle


collapsed lung. when air enters the pleural sacs. lungs cant expand normally.

Tidal Volume

normal breath, 1/2 liter of air enters/leaves.

Vital Capacity

maximum amount of air that can be breathed out after you inhale as deeply as you can.

Residual Volume

amount of air that is always in lungs. they never empty completely.

External Respiration

movement of oxygen from alveoli into blood to get through heart and out to tissues

Internal Respiration

oxygen moves out from blood supply into tissues and carbon dioxide is taken from tissues out throuh blood supply

Respiratory Membrane

two layer membrane between the walls of lung capillaries and alveoli; blood gases diffuse across it.




located at brainstem, control center for respiration

Respiratory Center


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Voice Recording