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What does the respiratory system of a fish look like?

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How Fish Breathe Project [WEEK 2]

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A fish couldn’t be a thing without their gills. Gills are quite important just to stabilize and keep them alive. Lungs on a fish couldn’t stand a chance. They would fill up with water and kill the fish almost instantly. These gills have many factors and are very complex  just to perform a simple task we as humans don’t even think about. These special gills filter out oxygen out of the dense water. These waters contain very little oxygen making the gills’ jobs even harder to absorb the most they can get. This is only some details on how much a fish depends on their gills.

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How Fish Breathe Project Article: 1

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The air-breathing lungs of mammals, including humans, must be dry and empty of fluids to work properly. When we take a breath, tiny air sacs in our lungs pull out of the air and carry it to our bodies' cells.

The lungs of mammals would not work very well for a fish, because one breath underwater would fill them with fluid and make them useless. Nonetheless, fish need to breathe, too. In order to remove from the water, they rely on special organs called "gills."

Gills are organs full of blood vessels. A fish breathes by taking water into its mouth and forcing it out through the passages. As water passes over the thin walls of the gills, moves into the blood and travels to the fish's cells.

If fish can breathe underwater, then why do some fish, like dolphins and whales, swim to the surface of the ocean? Because dolphins and whales aren't fish at all! They are mammals, just like humans.

Dolphins and whales are similar to humans in many ways: They give birth to live babies instead of laying eggs, are warm-blooded and have lungs for breathing air. When a whale or dolphin surfaces, it breathes air through its nose (commonly called a "blowhole") on the top of its head.

Fish facts:

There are more species of fish than all the species of amphibians, reptiles, birds and mammals combined.

Fish have been on the earth for more than 450 million years.

The largest fish is the great whale shark, which can reach 50 feet in length.

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Today we're diving in to explore the watery world of fish.

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How Fish Breathe Project Article: 2

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How Do Fish Breathe? | How Fish Breathe Under Water | petMD

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Despite living in water, fishes need oxygen to live. Unlike land-dwellers, though, they must extract this vital oxygen from water, which is over 800 times as dense as air. This requires very efficient mechanisms for extraction and the passage of large volumes of water (which contains only about 5% as much oxygen as air) over the absorption surfaces.