The Life of an Earthworm
Earthworm Dissection Lab PreAP Biology Vu

Lumbricus terrestris (Earthworm)

Objectives
Earthworm (Before Dissection) Notice its streamline body, which helps it slide through the soil. You can tell the head from the tail by locating the band of light colored flesh, which indicates its anterior end. This picture is the earthworm's dorsal side. The ventral side of the earthworm has a lighter color than the dorsal side. | Earthworm (After Dissection) The earthworms skin was really delicate. It was very easy to cut it open. Because earthworms have elastic skin, we had to use pins to examine the internal anatomy of the earthworm. | Earthworm's Organs Seminal Vesicle- produces sperm Seminal Receptacle- stores sperm Gizzard- Equivalent to a stomach Septa- Thin inner walls that divide segments into a separate compartment Crop- Temporarily stores food |
Earthworm (Before Dissection)
Earthworm (After Dissection)

Digestive System of an Earthworm
The digestive system of a worm maintains homeostasis for the rest of the body. However, apart from sustaining the body, the digestive system doesn't really work closely with any other systems. I suppose the nervous system tell the worm how much food it needs. And the circulatory system takes nutrients that the intestines suck out of the edible material.
Additional Info
Worms improves soil aeration, porosity, and permeability by tunneling. However, farmers kill millions of them each year. Worms are also used as bait for fishermen.
Earthworms can be found in every continent, except Antarctica.
They are hermaphrodites, hence their seminal vesicles and seminal receptacles. Baby worms are hatched from cocoons that are smaller than a grain of rice.
Bibliography
images.google.com
mypeoplepc.com/members/arbra/bbb/id19.html
learner.org/jnorth/search/WormNotes3.html
Lab Packet