Lungs vs Gills

Lungs vs Gills

1Why don’t people have gills?2Gillyweed Harry Potter Gillyweed Harry Potter with Gills A most useful plant!!3 4Whales Whales are mammals that swim like fish. They live their entire lives in the water but they have lungs just like people do. You never see a mammal with gills in nature. Why is that? 5GIGANTIC Gills We would need to have GIGANTIC gills. Gills work for fish because fish are cold blooded. (They do not regulate their own body temperature ) Cold blooded animals need a lot less oxygen than warm blooded animals do.6O2Imagine that you have a 100-pound human and a 100-pound fish sitting on a couch. A human being needs maybe 15 times more oxygen than the fish does. If the human then gets off the couch and starts swimming, the human needs even more oxygen. So does the fish but it can swim more efficiently.7Non-Stop SwimmingFish also use their mouths and gill flaps to constantly pump water over their gills. Lots of fish (like certain sharks) have to swim constantly so enough water flows through their gills. Compared to air, there just is not enough oxygen dissolved in water to keep a warm-blooded animal going.