The way of breathing of sea animals is similar to the way of humans, but our breathing system is very different. Sea animals have a gills to breathe. Gills are like lungs for humans.
Gills extract oxygen (which is dissolved in wather) and expel CO2.
Gills can be internal or external, this means they can protect the body of an animal or can stay in the external of the body.
In the event that stay in the internal, water goes into the mouth until it reaches the gills but in the event that it stays in the external, that isn't necessary.
Gills make two canals:
- One extract oxygen from the water.
- One puts the oxygen in the blood.
These canals are connected to more small canals.
When we see a sea animal, he is in movement. But when we observe a type of sharks who can breath, he is motionless.
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