Gaseous Exchange System in Mammals (OCR A-Level Biology A): Flashcards
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SA:V ratio change as organism size increases
SA:V ratio change as organism size increases
Decreases
Specialised gas exchange structures in mammals
Specialised gas exchange structures in mammals
Alveoli (air sacs)
Air pathway sequence in respiratory system
Air pathway sequence in respiratory system
Trachea → bronchi → bronchioles → alveoli
Where lungs are located
Where lungs are located
Thoracic cavity within rib cage
Muscle at base of thoracic cavity
Muscle at base of thoracic cavity
Diaphragm
Total surface area of alveoli in adult human
Total surface area of alveoli in adult human
70-100 m²
Epithelium type in alveolar walls
Epithelium type in alveolar walls
Simple squamous epithelium (one cell thick)
Blood structures surrounding alveoli
Blood structures surrounding alveoli
Dense networks of capillaries
Oxygen diffusion direction in gas exchange
Oxygen diffusion direction in gas exchange
From alveolar air into blood
CO₂ diffusion direction in gas exchange
CO₂ diffusion direction in gas exchange
From blood into alveolar air