ARTHROPODA
Crustacean: Crabs: Crabs have pincher claws that they use to obtain food. These claws tear apart the food. The crab then uses the claw to move the food closer to its mouth. For finer foods, crabs have specialized mouth parts. They have an esophagus that leads to the stomach where they have a chamber called gastric mill. This is where the food eventually goes when it is small enough. The food then passes through the hepatopancreas or midgut gland. The food then begins to move through the intestine and then the food is either absorbed or excreted.
Insect: Cockroaches:The digestive system of a cockroach is pretty simple. It will first insert food into its mouth where it will be broken down and then sent down the esophagus. The food gets sent to an organ called a gizzard. The food is crushed and processed here. Next is the stomach and then the intestines. However, to actually digest the food, component molecules are used which are found in blood that pass through the intestine wall. Depending on the food, energy will be taken and stored in the roach’s body. After the intestine, the food is excreted.
Arachnid: Spider: The mouth of a spider can be found right under its eyes. Unlike many other Arthropods, smaller spiders do not have parts of their mouths that can be used for chewing. These arachnids only eat liquids. In order to obtain food, a spider uses its chelicerae which are a pair of appendages that the spider uses to kill its prey. These appendages are located right above the mouth. Spiders have a digestive tube that is the length of the body. I the stomach you will find a cephalothorax which is a stomach used for sucking. This helps to move the food to the intestine. Juices found in the digestive tube help to break down the food into pieces that can easily pass through the intestine walls and then in to the blood. The food is circulated to all parts of the body. Another area where food is pulled through is a fingerlike cavity called the caeca. This area helps spiders to store food for a longer amount of time without eating.
Crustacean: Crabs: Crabs have pincher claws that they use to obtain food. These claws tear apart the food. The crab then uses the claw to move the food closer to its mouth. For finer foods, crabs have specialized mouth parts. They have an esophagus that leads to the stomach where they have a chamber called gastric mill. This is where the food eventually goes when it is small enough. The food then passes through the hepatopancreas or midgut gland. The food then begins to move through the intestine and then the food is either absorbed or excreted.
Insect: Cockroaches:The digestive system of a cockroach is pretty simple. It will first insert food into its mouth where it will be broken down and then sent down the esophagus. The food gets sent to an organ called a gizzard. The food is crushed and processed here. Next is the stomach and then the intestines. However, to actually digest the food, component molecules are used which are found in blood that pass through the intestine wall. Depending on the food, energy will be taken and stored in the roach’s body. After the intestine, the food is excreted.
Arachnid: Spider: The mouth of a spider can be found right under its eyes. Unlike many other Arthropods, smaller spiders do not have parts of their mouths that can be used for chewing. These arachnids only eat liquids. In order to obtain food, a spider uses its chelicerae which are a pair of appendages that the spider uses to kill its prey. These appendages are located right above the mouth. Spiders have a digestive tube that is the length of the body. I the stomach you will find a cephalothorax which is a stomach used for sucking. This helps to move the food to the intestine. Juices found in the digestive tube help to break down the food into pieces that can easily pass through the intestine walls and then in to the blood. The food is circulated to all parts of the body. Another area where food is pulled through is a fingerlike cavity called the caeca. This area helps spiders to store food for a longer amount of time without eating.