The Life of an Earthworm

Earthworm Dissection Vu-PAP Bio-4 Melissa Barbosa

Lumbricus terrestris

Lumbricus terrestris, is a member of the phylum Annelida. It's thin snake-like shape helps it move through the soil. The earthworm forms deep burrows, and comes to the surface to feed. They usually feed on plant material, they have been observed eating dead insects and feces. As material passes through it's digestive system, sand grains in the gizzard help the food to be grind-ed, which is later digested and absorbed in the intestine.

Objective:

In this investigation, students will observe the external and internal structure of an earthworm.

Circulatory System*

Closed circulatory system, circulates blood through vessels. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels. The aortic arches function like a human heart. There are five pairs of aortic arches,which pump blood into the dorsal and ventral blood vessels. The dorsal blood vessels are responsible for carrying blood to the front, and ventral blood vessels are responsible for carrying blood to the front.