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Comparing The Human, Earthworm and Perch Digestive System

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Anisha Patel

on 12 June 2015

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Transcript of Comparing The Human, Earthworm and Perch Digestive System

A Comparison of the Digestive system
of a Human, Earthworm and Perch

By: Anisha Patel
The Digestive System
The Human Digestive
System
The digestive system starts at the mouth
where the food is broken down to small
pieces with saliva which is produced
by the salivary gland. Then the broken
down food goes through the pharynx then into the esophagus. The broken down food is too large to yet be digested, it then travels to the stomach where the stomach mixes the food with acids that further break the food down.
From the stomach the food is finally small enough to then be in the small intestine so,that it can absorb the nutrients from the food. The liver produces digestive juices called bile. The food then travels to the large intestine where the liquids are absorbed. Then the leftover food which is waste is pushed to the rectum where it leaves the body.
The Earthworm Digestive System
Perch Digestive System
To our luck we dissected a fish with a partially digested fish inside
In conclusion, in the human, earthworm and perch digestive system they have similar digestive properties but they differ slightly because of what each animal eats and what organs they have to break down the food and absorb the nutrients.
The basic purpose of the digestive system is to turn the food that the animals eat and covert the food to essential nutrients that are absorbed by the body. All the nutrients from the food are then used to provide energy and maintain the animal's health.
Similarly the earthworm has the same digestive system with a few independent functions specifically for the worm. All animals begin the digestion of their food at the mouth.

The food is swallowed and travels down the
pharynx into the esophagus. Then the food travels to the crop which is like the stomach. It stores the food. Later the food travels to the gizzard which grinds the food with the rocks the worm eats. As the food passes into the intestines there are fluids released to further digest the food much like what the liver does. The intestine absorbs the nutrients and transports it to the rest of the body. Lastly, the waste exits the body out the anus.
The fish digestive system starts at the mouth like a human and earthworm. Similarly the fish eats the food and as the food goes down the pharynx. As the the food goes down the esophagus it goes into the gizzard where the food is further broken down. The food then travels to the stomach where much like the human digestive system the food is mixed with acids to break it down. Right before the intestine the perch has a small tube called the pyloric caeca its function is to secrete trypsin and enzymes active in the intestines, it is also considered likely that they are important in neutralizing the acidity of the partially digested food that leaves the stomach. Continuing down, the nutrients from the food is absorbed by the intestine and transferred to the rest of the body like the other animals. Finally, the faeces pass out the fish's body out the rectum, also like a human and earthworm.
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