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The Digestive System of an Octopus

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Rebecca LM

on 6 December 2013

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Transcript of The Digestive System of an Octopus

Facts About the Octopus Digestive System
An octopus has a two way digestive system with a mouth and an anus.
The octopus usually hunts for lobsters, crabs, and shrimp.
An octopus has three different ways to eat their food:
One way is to simply rip the shell open using their suckers.
Another way is to bite the shell open using their beak.
If neither of these work, they can drill though the shell.
After drilling, the octopus injects a toxin into its prey that paralysis it making it easy to eat
After consumption, the food will be digested in the stomach and digestive sac and than released out the anus.

The Digestive System of a Human and an Octopus
Digestive System
Parts of the Octopus Digestive System
Body Plan of an Octopus
The octopus is closely related to clams, snails and slugs.
But octopuses are from the class cephalopoda along with squid, cuttlefish and nautilus.
The octopus is the most evolved cephalopod.
The octopus does not have any outer or inner shell like the other cephalopods.
The word cephalopod means 'head footed', this refers to the fact that cephalopods arms come straight out of their heads.
The octopus only has eight arms where as some cephalopods have tentacles as well as arms.
The octopus uses its tentacles for eating, moving, hunting, tasting and mating.
Behind the octopus's head, directly opposite the arms, is its mantle.
The mantle is where all of the octopuses organs are, its gills, digestive system and reproductive system are all in this one space.
The muscles in the mantle protect the organs and help with respiration and contraction.
The octopus has a funnel called a siphon which is used as a pathway for water.
Instead of having a protective shell the octopus has many other defense mechanisms such as the ability to change the colour and texture of their skin to blend in with their surrounding. They can do this in less than a second.
Parts of the Human Digestive System
Food is placed into the mouth and chewed whilst saliva is produced to break the food down even further.
Food enters the esophagus where muscles push food down into the stomach
Small intestine
Protease and amylase enzymes break down the food until the glucose and lipids are small enough to fit through the villi.
Produces enzymes for the small intestine that break down proteins, fats and carbohydrates that are in our food.
Two of the livers main functions are to produce bile and to cleanse and purify the blood from the small intestine
Sit under the liver and stores bile. When you are eating the Gallbladder sends some bile into the Small intestine
Large intestine
When the food reaches the Large intestine only the waste products are left. The Large intestine sucks out the rest of the moisture from the food and the rest moves onto the rectum.
The Rectum stores feces until it is ready to leave the body when it is pushed into the Anus.
The Anus control the excretion feces by using the anal sphincter muscle.
Food enters the stomach where it is broken down by hydrochloric acid. The food is then churned into a mush and released into the small intestine.
Most of the tearing and cutting is done by the beak. If the victim happens to be a clam, the beak is used to drill through the shell and the digestive juices are injected to dissolve the tissues.
The partly digested prey passes into the octopus' esophagus which has more digestive glands.
The food then exits the octopus through a fold in the mantle where the anus also exits the body. Octopus eggs and ink are excreted through the same opening.
The lips of the mouth are ridged to help keep grip on the victim. Once the prey has tissue damage, one pair of salivary glands secretes digestive enzymes while another pair secretes a toxin which immobilizes the victim.
This esophagus then opens up into the crop which has even more digestive glands that do what the pancreas and liver would do in a human. The crop is pocket for temporary storage of partly digested food before it enters the stomach.
An octopus' stomach is a very muscular organ. When the food reaches this stage, more enzymes are added by ducts from the caecum. After the food has been churned up into a slush in the stomach, it enters the caecum.
In the caecum the food is filtered. Nutritive parts are kept for the body to use. Indigestible bits move on to the next stage.
What remains from the food (pieces of shell and bone) go through the intestine an into the anus.
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