Human Gas Exchange (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
Location of gas exchange in mammals
Location of gas exchange in mammals
Epithelium of the alveoli
Number of alveoli per human lung
Number of alveoli per human lung
Approximately 300 million
Total surface area of alveoli in lungs
Total surface area of alveoli in lungs
Around 70
Three essential features of exchange surfaces
Three essential features of exchange surfaces
Thin/permeable, large surface area, well-ventilated
Structure of alveolar walls
Structure of alveolar walls
Single layer of epithelial cells
Time red blood cells spend in pulmonary capillaries
Time red blood cells spend in pulmonary capillaries
Approximately 0.75 seconds
Width of pulmonary capillaries
Width of pulmonary capillaries
7-10
Type of diffusion process in alveoli
Type of diffusion process in alveoli
Simple diffusion down concentration gradients
Direction of oxygen movement during gas exchange
Direction of oxygen movement during gas exchange
From alveolar air to blood
Direction of movement during gas exchange
Direction of movement during gas exchange
From blood to alveolar air