Earthworm Dissection Essay

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Earthworm Dissection. QUESTION: What is the purpose of studying an dissecting an earthworm? INTRODUCTION: Annelids are segmented worms that make up the phylum annelida. The phylum includes the earthworms and other relatives, for example, leeches and a large number of marine worms also known as plychaetes. There are about 9000 species of annelid known today. The ascaris are an intestinal worm, resembling earthworms in size and appearance. MATERIALS: * Dissecting pins * Gloves * Forceps * Lab apron * Scissors * Paper towel * Scalpel * Water * Dissecting probe * Preserved earthworm * Hand lens * Dissection tray PROCEDURE: We first put on our lab aprons, gloves, and (for the girls) make sure your hair is pulled back. We get the dissection tray and place the earthworm. Grab two dissecting pins and place them one on each end of the earthworm. After the earthworm is well placed in the tray, grab the scalpel and start opening the worm carefully, do not press too much because then the intestines will open too. Once it’s fully opened, we will use the dissecting pins and the dissecting probe. With the dissecting probe we keep on opening the body to fully see the earthworm from the inside. Grab the pin and place them one on each side, as much as you want to see the whole earthworm’s insides. This is the part where we start to investigate and start analyzing the earthworm from the inside. Make sure to take notes and observe the external and internal structures of earthworm anatomy. Start locating the digestive tract. Refer to the figure below; identify the pharynx, esophagus, crop, gizzard, and intestine. RESULTS: After locating everything that it is shown in the drawing, make notes and in your worksheet start writing your notes and observations.

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