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Alaina Nguyen
Blume Ch 13.2
Question | Answer |
---|---|
What does Annelids mean? | little rings |
What are some characteristics of Annelids? | -tube shaped bodies that are divided into many segments -have setae -bilateral symmetry -a body cavity that holds organs 2 body openings (mouth & anus) -can live in freshwater, salt water, & moist soil |
What are setae? | bristle like structures on the outside of each body segment, they helt it move and "sense" the environment |
What is the crop? | a sac used for storage |
What is the gizzard? | a muscular structure which grinds the soil and the bits of organic matter |
In which part of the earthworm does the organic matter is broken down & nutrients are absorbed by the blood? | the intestines |
Where does soil enter, in an earthworm? | mouth |
Where do the wastes leave the worm? | through the anus |
How does the digestion & excretion of an earthworm help the soil? | the taking in of soil to get food helps provide spaces for air and water to flow through the soil and mix the soil, also the castings (wastes) fertilize the soil |
Describe an earthworms circulatory system. | -closed circulatory system -2 blood vessels -5 heart-like "aortic arches" that pump blood -smaller vessels go into each body segment |
How does an earthworms respiratory system work if it has no gills or lungs? | Oxygen and Carbon-dioxide exchange through their skin |
Do earthworms have a brain? | Yes, in their front segment |
How do their nerves work? | Nerves in each segment join to form the main nerve cord that connects to the brain |
What do they respond to? | light, temperature, & moisture |
Earthworms are hermaphrodites. True or False? | True |
Can earthworms fertilize its own eggs? | no |
What 2 uses for leeches? | 1. to keep blood from flowing after surgery 2. their saliva helps heal your wounds quicker |