Human Gaseous Exchange (Grade 11 NSC Matric Life Sciences): Flashcards
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3 main components of respiratory system
3 main components of respiratory system
Air passages, lungs, breathing muscles
Alveoli wall structure
Alveoli wall structure
One cell thick, squamous epithelium
Inhalation: active or passive process?
Inhalation: active or passive process?
Active process requiring energy
Exhalation: active or passive process?
Exhalation: active or passive process?
Passive process when muscles relax
Diaphragm action during inhalation
Diaphragm action during inhalation
Contracts, flattens, moves downward
O₂ % inhaled vs exhaled (sleeping)
O₂ % inhaled vs exhaled (sleeping)
Inhaled: 21%, Exhaled: 16%
External gaseous exchange location
External gaseous exchange location
At alveoli between air and blood
Internal gaseous exchange location
Internal gaseous exchange location
At tissues between blood and cells
Oxygen transport mechanism in blood
Oxygen transport mechanism in blood
Combines with haemoglobin to form oxyhaemoglobin
Brain region controlling breathing
Brain region controlling breathing
Medulla oblongata