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earthworm dissection template
the following is a classification of a species in the earthworm family lumbricidae. the clitellum is a swelling of the body found in sexually mature worms and is active in the formation of an egg capsule, or cocoon. eggs are produced in the ovaries and pass out of the body through female genital pores. the earthworm takes in a mixture of soil and organic matter through its mouth, which is the beginning of the digestive tract. the nerve collar surrounds the pharynx esophagus and consists of ganglia above and below the pharynx. the prostomium is a kind of lip which is located on the front of the mouth. the final segment of an earthworm contains the anus which is where waste is secreted. the anterior of the animal is more cylindrical than the flattened posterior and is the closest to the clitellum.
the other end of the worm’s body is the posterior end, where the anus is located. at the very front of an earthworm, you will find the pharynx. a large blood vessel runs across the top of the earthworm and this is called the dorsal blood vessel. continue to lay the skin back until you have uncovered a centimeter or so of the intestine. 7. use the diagram below to locate and identify the five pairs of aortic arches, or hearts. gently press on the crop and gizzard to test their firmness. the gizzard is followed by a long intestine in which both digestion and absorption occur. find one pair of ganglia under the pharynx and another pair of ganglia above the pharynx.
earthworm lab report template. earthworm dissection lab. purpose. to observe and learn, through dissection, about the external and internal structures of in this article, we cover earthworm anatomy and how to dissect and earthworm safely in the lab of a college or university. lesson plan: earthworm dissection. background: the earthworm is an invertebrate in the phylum annelida; it is a segmented worm. the segments are., earthworm dissection worksheet, earthworm dissection worksheet, earthworm dissection student answer sheet, earthworm lab report template, earthworm anatomy figure 38 3 answers
earthworm dissection template format
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the earthworm is an excellent model for studying the basic pattern of organization we offer a full range of dissecting equipment to fit all your lab needs. this author provides an excellent student lab-report format, explains how it adapts to earthworm dissection. pictures: modern biology, holt. modified from: http://sps./massengale/earthworm_dissection.htm. the following is a classification dissecting pan. forceps. probe. procedures: external observation of earthworm. 1. examine your earthworm and determine the dorsal and , earthworm dissection lab report 28a, earthworm dissection quizlet, earthworm dissection quizlet, earthworm dissection lab quizlet, earthworm post lab, earthworm dissection worksheet, earthworm dissection student answer sheet, earthworm lab report template, earthworm anatomy figure 38 3 answers, earthworm dissection lab report 28a, earthworm dissection quizlet, earthworm dissection lab quizlet, earthworm post lab
earthworm dissection template download
worms have the epidermis; wich is like our skin, a layer of nerve tissue, wich acts like our sense of touch. they have a dorsal and a ventral vessel branching off the hearts, which transports the blood, rich with oxygen and nutrients through the body. the digestive system is similar; we both have a mouth, stomach, and intestines. they have a tongue like lobe above the mouth called the prostomimum. adult worms have a distinct swelling called the clitellum, its located about one third of the way down the earthworm. the clitellum is only found in adult worms, younger worms don’t have one. the shorter part to one side of the clitellum is the anterior, or head of the worm.
the periproct is the last part of the earthworm. insert the scissors by the side and cut in a straight line all the way up through the mouth. specialized sensory cells in the mouth, called the buccal cavity, detect chemicals the worm needs such as sucrose and saline. these organs perform the same basic function of keeping the worm’s blood flowing as it distributes oxygen and nutrients throughout the body. explain why the crop and gizzard are important parts in the digestive system of the earthworm. since worms don’t have teeth and can’t chew their food, the muscular gizzard helps break it down into smaller pieces (birds do this too). in this way all the organs in the worm’s digestive system work together to help it eat and survive.