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Vivek Patel

Description: Blume Ch 13.2

What does annelids mean? "little rings"
Annelids have what shaped bodies? tube shaped
Annelids have a what on the outside of each body segment? setae (bristle like structures that help move & "sense" the environment)
What are the main characteristics of segmented worms? bilateral symmetry, a body cavity that holds organs, and two body openings
What places do segmented worms live in? salt water, freshwater, and moist soil
What are the front and back ends of an Earthworm called? Anterior- front and posterior-end
What are examples of segmented worms? marine worms, earthworms, and leeches
What is the crop used for? storage
Where are the organic matter broken down and nutrients absorbed by the blood? the intestines
What are the characteristics of the circulation system in an earthworm? closed circulatory system, 2 blood vessels- one along the top and one along the bottom, and they meet in the front, 5 aortic arches which pump blood, smaller vessels go into each body segment
How does their digestion processes benefit the soil? helps provide spaces for air & water & helps fertilize the soil
What are their characteristics in respiration? Oxygen and Carbon-Dioxide exchange through their skin, and it is covered with a thin watery mucus.
Describe an earthworm's nerve response. Earthworms have a small brain in their front segment, nerves in each segment join to form the main nerve cord that connects to the brain, and they respond to light, temperature, & moisture.
Describe an earthworm's reproduction. Earthworms are hermaphrodites, but it can’t fertilize its own eggs. It has to receive sperm from another earthworm to reproduce.
What do leeches feed on? the blood of other animals
Created by: vivek151