Gas Exchange in the Alveoli (Leaving Cert Biology): Flashcards
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Practise the cards
12 cards from this deck
No. of bronchioles each bronchus branches into
No. of bronchioles each bronchus branches into
1 million
What each bronchiole ends in
What each bronchiole ends in
Alveolus (sac)
Why alveoli have large surface area
Why alveoli have large surface area
For efficient gas exchange
Why alveoli have rich blood supply
Why alveoli have rich blood supply
To carry gases away from the lungs
Why alveoli have elastic walls
Why alveoli have elastic walls
For efficient inhalation and exhalation
Why alveoli have moist surfaces
Why alveoli have moist surfaces
Gases diffuse more quickly into blood
% of alveolus surface covered by capillaries
% of alveolus surface covered by capillaries
90%
Why red blood cells slow in narrow capillaries
Why red blood cells slow in narrow capillaries
More time for oxygen to diffuse into them
What oxygen binds to in red blood cells
What oxygen binds to in red blood cells
Haemoglobin
Gas that diffuses out of blood into alveolus
Gas that diffuses out of blood into alveolus
Carbon dioxide
Definition of diffusion
Definition of diffusion
Movement of substances from high to low concentration
Blood vessel returning blood from lungs to heart
Blood vessel returning blood from lungs to heart
Pulmonary vein