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Excretion

The Excretory system

namefunction
Removal of metabolic wastes Lungs,Tubes,Structure,Alveolus,Skin-Sweating only,Kidney- Blood supply-nephron-filtration-reabsorbtion-secretion.
Moist Alveoli walls Diffusion and dissolving of O2/CO2 easier and more efficent.
One cell thick alveoli walls thin walls providing short diffusion pathway so gasses can move rapidly across membrane from lungs (air) to capillaries (Blood) and vice versa.
Folded alveoli walls Increases surface area allowing diffusion of larger amounts of gases across the membrane in a set time period.
Capillary network assisting gas exchange in lungs Lots of thin walled capillaries surround alveolus. Short diffusion pathway for rapid diffusion of O2/CO2 gasses, Large amounts of diffusion in set time because of high gas concentration gradient.
Capillary network assisting gas exchange in lungs 2 Large surface area allowing large amounts of diffusion in capillaries, Continuous flow of blood in capillaries- rapid diffusion as concentration gradient is maxamised.
Gaseous exchange Breathing portion Human Lungs contain Approximately 300 million alveoli.
Created by: callum.smyth
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