Phylum Annelida: Earthworm Flashcards
What are 4 characteristics of an earth worm?
- Body is long, round, and segmented
- Range in size from 0.5mm to 3m long
- Vary in color, patterning, number of bristles etc.
- Body segments separated by a septa (which are internal walls)
Most body segments are _______ to each other, however some are modified to perform _________ _______
identical
special functions
After the food enters through the mouth, where does it pass through and where is it stored?
Passes through the esophagus
stored in the crop
After the food is stored in the crop, where does it passes through next?
Passes through the gizzard
What does the gizzard do to the food?
it mechanically break the food down by grinding
then it goes to the intestine
What does the intestine do to the food?
it chemically break down the food
What happens to the undigested material?
Removed through the ANUS
- How do aquatic annelids breath?
2. How do terrestrial annelids breath?
- gills
2. skin
Is the circulatory system of the earthworm open or closed? And why?
Closed
Because blood is contained within a network of blood vessels
What do the aortic arches act as?
Aortic arches pumps the blood through the blood vessels
Blood flows toward the head of the worm in the _______ and toward the back of the worm in the ________
Dorsal vessel
Ventral vessel
How is blood moved through the bodies of annelids?
- 5 pairs of AORTIC ARCHES pump blood into the ventral blood vessels.
- Goes to the ring vessels which goes to the organs
- From organs goes to the cells to the dorsal blood vessel
What is Nephridia?
Place where:
WATER, MINERAL SALTS, UREA are filtered out of the body fluids of annelids
* After, they are excreted
How many nephridia are there?
2 in each body segment
What is a Ganglia and which side does it run along?
2 nerves form the paired ganglia
Run along the GUT to the VENTRAL side of the worm where they join to become a VENTRAL nerve cord which runs to the last segment
