The lungs (AQA GCSE Biology): Flashcards
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Main function of lungs
Main function of lungs
Gaseous exchange
Definition of gaseous exchange
Definition of gaseous exchange
Swapping O₂ and CO₂ between air and blood
Air pathway order in respiratory system
Air pathway order in respiratory system
Mouth/nose→trachea→bronchus→bronchioles→alveoli
Another name for trachea
Another name for trachea
Windpipe
Definition of alveoli
Definition of alveoli
Tiny air sacs at end of bronchioles
Thickness of alveoli walls
Thickness of alveoli walls
One cell thick
Process by which gas exchange occurs
Process by which gas exchange occurs
Diffusion
Direction of oxygen movement in alveoli
Direction of oxygen movement in alveoli
From alveolar air into blood
Direction of CO₂ movement in alveoli
Direction of CO₂ movement in alveoli
From blood into alveolar air
Oxygen % in inhaled air
Oxygen % in inhaled air
21%
Oxygen % in exhaled air
Oxygen % in exhaled air
16%
CO₂ % in exhaled air
CO₂ % in exhaled air
5%
Why exhaled air has more water vapour
Why exhaled air has more water vapour
Alveoli surface is moist
Surface area created by alveoli
Surface area created by alveoli
Blood vessels surrounding alveoli
Blood vessels surrounding alveoli
Capillaries