Earthworm Dissection Lab

Mason Johnson Vu-PAP-bio-3

What is an earthworm?

The earthworm, Lumbriscus Terrestris, is part of the phylum Annelida. The earthworm lives almost it's whole life in burrowing though the loose topsoil. The earthworm mainly feeds on decaying plant and animal matter. The tube-like configuration assists in easy movement through the soil. The main predator of the earthworm happens to be the bird.

Objectives

- The parts of an earthworm

- The roles of these parts

Big image

The circulatory system of the earthworm

The earthworm has a closed circulatory system. Blood is kept inside of blood vessels and circulated many times for maximum use. Unlike most organisms the earthworm lacks lungs, as well as gills. The earthworm uses it's skin to absorb oxygen from the soil. The oxygen is then transferred down the dorsal blood vessel to the 5 aortic hearts. The esophagus pumps the blood to the lower dorsal vessel where it is then pumped to all the organs that are in need of oxygen as well as blood.

Other (not completely useful) information

earthworms are hermaphrodites.

earthworms can regenerate almost all sections of their body.

earthworms can get as large as 22 feet and average around 6 ft in parts of Africa.

earthworms have no eyes, but can sense light.

fossils prove that earthworms have been around for roughly half a billion years.