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Shelly's science spot earthworm dissection answers 2025

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The document outlines a lab activity focused on the dissection of earthworms, which are invertebrates belonging to the phylum Annelida. It provides background information on the anatomy and physiology of earthworms, including their reproductive, circulatory, digestive, nervous, and excretory systems. The document also includes pre-lab questions that students must answer to prepare for the dissection.

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Which part of the earthworm is used to absorb nutrients?

Then, they have a gizzard, which through muscular contractions, helps to grind their food down into smaller pieces, like our teeth. After the food passes through the gizzard, it moves into their intestine, where they absorb nutrients (also like us). Any undigested material is excreted as a worm casting.

How do you dissect an earthworm?

2:27 7:27 We place the pin through the skin on the side of the worm to avoid further damage to the internalMoreWe place the pin through the skin on the side of the worm to avoid further damage to the internal organs. Next we hold the skin on the opposite side with the forceps.

How do you dissect an earthworm?

2:27 7:27 Biology Lab || Earthworm Dissection - YouTube YouTube Start of suggested clip End of suggested clip We place the pin through the skin on the side of the worm to avoid further damage to the internalMoreWe place the pin through the skin on the side of the worm to avoid further damage to the internal organs. Next we hold the skin on the opposite side with the forceps.

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Do earthworms have complete digestive system?

Earthworms have a complete digestive system, one which has two openings, the mouth and the anus.

What are three tips or techniques used when dissecting an earthworm?

Earthworm Dissection: Internal Anatomy Lay the worm on your dissecting tray with its dorsal side facing up. Use dissection pins to secure each end on the tray. Start your dissection about an inch posterior to the clitellum. Lift up the skin with a pair of forceps and snip an opening with a pair of dissecting scissors.

How do you prepare an earthworm for dissection?

Put the worm in a bowl of 50% alcohol. The alcohol causes the body and the muscles to relax. Without that, the worm will most likely be stiff and contracted, making for a harder time dissecting.

How do you prepare a live earthworm for dissection?

Place the earthworm on its ventral side. (The ventral side is more flattened than the dorsal side.) Using dissecting scissors, cut through the dorsal body wall posterior to the clitellum and continue the incision toward the prostomium. Be careful not to cut too deep or you will slice into the digestive system.

Why are earthworms commonly dissected?

0:04 21:38 And it's designed to increase in size because. That's where the soil is going to get stored until itMoreAnd it's designed to increase in size because. That's where the soil is going to get stored until it makes it to the next phase of digestion called the gizzard.

Shelly's science spot earthworm dissection answers 2025

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