Anatomy of Earthworms and Planaria

Make sure to study diagrams

Digestive tract of Earthworms

mouth—> pharynx —> esophogus—> crop (stores food) —> gizzard (mechanical grinding) —> intestine

hermaphrodites

organism that has both female and male parts

Brain of planeria

ganglia and located in anterior region

cephalization

the majority of its sense organs are located in anterior region

How do planeria remove waste?

excretory system that include flame cells that line the lateral edge of the organism to remove waste

How do planeria reproduce?

two pair up and fertilize each other’s eggs

acoelomate body

an animal that has no internal body cavity to hold organs

transverse fission

the ability to reproduce asexually (without another planeria present)

seminal vesicles

used for producing sperm

dorsal blood vessel

dark line that runs down the dorsal side of the worm

ventral blood vessel

blood vessel that can be seen on the underside of the worm

clitellum

swelling near the anterior side of earthworm

Where is the mouth located on the earthworm?

anterior (front) end; on first body segment (thinner part)

Where is the anus located on earthworm?

posterior (rear) end; on last segment

How many hearts does an earthworm have?

5 hearts

Where is the heart located in an earthworm?

over the esophagus