28 terms

7th grade Ch 12 D & 12 E Quiz

Invertebrates
STUDY
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Terms in this set (...)

closed circulatory system
A circulatory system in which the oxygen-carrying blood cells never leave the blood vessels
aortic arches
The heart like pumping organs of earthworms; help control an earthworms blood pressure
Annelida
Phylum of Earthworms
Name an example of a segmented worm.
Earthworms, fireworm, sandworm, leeches
cuticle
protective covering that protects from harmful chemicals or substances
setae
Bristle-like structures that help segmented worms move
What does an earthworm use for respiration?
They breathe through their epidermis or skin.
esophagus
A long tube that food passes through to get into the stomach.
crop
Part of the digestive tract of many animals where food is temporarily stored until it can continue to the gizzard
gizzard
Found in digestive tract of birds, earthworms, and grasshoppers. Thick muscular wall; breaks down food mechanically
arteries
Blood vessels that carry blood away from the heart
veins
Blood vessels that carry blood back to the heart
hermaphrotoditic
Condition of having both male and reproductive organs; example - earthworms
How do earthworms help plants grow?
1) Earthworms excrement or casts are rich in minerals needed for growth. 2) The movement of earthworms helps loosen the soil so it can hold more air and water.
Mollusca
Phylum of Mollusks
Gastropoda
Class under Mollusca; many with one coiled shell; marine, freshwater, or terrestrial. Ex: snails and slugs
Cephalopoda
Class under Mollusca; most without a shell; have tentacles; marine. Ex: squids and octopuses
Octopuses can move swiftly through the waters by squirting water out of their
siphons.
Can an octopus reproduce asexually by regeneration?
No but they can regenerate their tentacles.
Bivalvia
Class under Mollusca; two-part hinged shell; marine or freshwater; Ex: clams and oysters
mantle
The thin skin that covers the clam's soft body that manufactures the shell.
bivalves
2 shells held together by 1 or 2 muscles
univalve
An organism with a single shell
siphons
Two structures used by clams to filter feed; one draws food and water in and the other sends water and wastes out
Echinoderms
a phylum of ocean dwelling animals that includes starfish, sea urchins, sand dollars, and sea cucumbers - have radial symmetry
What type of symmetry do echinoderms have?
radial symmetry
A echinoderms ability to move and attach itself is powered by
a water vascular system
tube feet
part of the water-vascular system of starfish - set up in rows at the bottoms of each ray - function like tiny suction cups allowing the starfish to move

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