Gills have numerous folds that give them a very large surface area.
The rows of gill filaments have many protrusions called gill lamellae. The folds are kept supported and moist by the water that is continually pumped through the mouth and over the gills.
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Help in gaseous exchange
gaseous exchange
Gaseous exchange is a natural process, ventilation is a forced process.
The site for gaseous exchange is the lungs. Carbon dioxide is exhaled and is substituted for oxygen which is inhaled.
gaseous exchange - in the alveolis
alveoli is the site for gaseous exchange. They are the air filled sacs where carbon dioxide and oxygen is exchanged
The stomata are meant for gaseous exchange, however transpiration also occurs when they are open.
allow gaseous exchange
the lungs
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allow gaseous exchange