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Online earthworm dissection 2025

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The document provides a detailed guide for a virtual lab on earthworm dissection, outlining instructions for exploring the external and internal anatomy of earthworms. It includes questions related to their body systems, digestive and reproductive functions, and anatomical features, encouraging students to engage with interactive diagrams and label structures accurately.

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What is the difference between the dorsal and ventral side of an earthworm?

Notice that the earthworm has a rounded dorsal (back) surface and a flatter ventral (belly) surface. Usually, the dorsal surface is darker than the ventral surface (though sometimes this is obscured in the preservation process). Lightly rub your finger along the ventral side toward the posterior end of the worm.

Why do we dissect earthworm?

Earthworms are ideal specimens to use for teaching basic anatomy and investigating simple organ systems. Although these annelids, or segmented worms, are one of the simpler preserved invertebrates, the digestive, circulatory, reproductive and nervous systems are well developed and easy to identify.

How to identify the dorsal side of an earthworm?

Because it is defined by a black median mid-dorsal line along the bodys longitudinal axis, the dorsal surface is darker than the ventral surface. The earthworms dorsal surface is darker than its ventral surface. Setae are also absent on the dorsal surface.

Does an earthworm have a dorsal or ventral heart?

Earthworms are an example of a simple invertebrate animal with a closed circulatory system. Earthworm circulatory systems consist of five pairs of aortic arches which pump blood from the dorsal blood vessel to the ventral blood vessel. The aortic arches act like hearts and are commonly referred to as pseudohearts.

What is the ventral side of the earthworm?

The bottom-side of an animal is called the ventral surface. In many animals, the ventral surface is a lighter colour or shade than the dorsal surface. The periproct is the last segment of an earthworm. Each segment, except the first and last, have tiny bristle-like structures called setae.

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What is the ventral of an earthworm?

The dorsal blood vessel runs along the length of the upper side of the earthworm. It contracts and pumps blood to the aortic arches. The ventral blood vessel runs along the lower length of the earthworm.

How to do dissection of 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.

Online earthworm dissection 2025

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