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Ch.25 Definitions
Sponges
22
Other
Not Applicable
03/30/2004

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Term
Filter Feeding
Definition
A method in which an organism feeds by filtering small particles of food from water as it passes by or through some part of the organism.
Term
Hermaphrodite
Definition
An individual animal that can produce both eggs and sperm.
Term
External Fertilization
Definition
Type of fertilization in which eggs and sperm are both released into water.
Term
Internal Fertilization
Definition
Where eggs remain inside the animals body, and sperm are carried to the eggs in the flow of water.
Term
Polyp
Definition
The stage with a tube shaped body and a mouth surronded by tentacles.
Term
Medusa
Definition
The stage with a body shaped like an umbrella with tentacles hanging downward.
Term
Nematocyst
Definition
A capsule that contains a coiled , threadlike tube. The tube may be sticky aor barbed, and it may contain toxic substances.
Term
Gastrovascular Cavity
Definition
In cnidarians, a large cavity in which digestion takes place.
Term
Nerve Net
Definition
Conducts nerve impulses from all parts of the cnidarians body,but there is no control center such as the brain found in other animals.
Term
Cnidarians
Definition
3 classes Hydrozoa,Scyphozoa, and Anthozoa
Term
Medusa
Definition
The stage with a body shaped like an umbrella with tentacles hanging downward.
Term
Pharynx
Definition
A tube like muscular organ. Found in planarian's.
Term
Regeneration
Definition
The replacement or regrowth of missing body parts.
Term
Scolex
Definition
The knob-shaped head of a tape worm.
Term
Proglottid
Definition
A detachable section of a tapeworm that contains muscles,nerves,flame cells,and male and female reproductive organs.
Term
Mantle
Definition
A thin membrane that surrounds the internal organs of a mollusk.
Term
Radula
Definition
A toungelike organ with rows of teeth.
Term
Open circulatory system
Definition
System where blood moves through vessels into open spaces around the body organs.
Term
Closed Circulatory System
Definition
system in which blood moves through the body enclosed entirely in a series of blood vessels.
Term
Nephridia
Definition
Organs that remove metabolic wastes from an animal's body.
Term
Setae
Definition
Tiny bristles, that help segmented worms move by providing a way to anchor their bodies in the soil.
Term
Gizzard
Definition
A sac with muscular walls and hard particles that grind soil before the soil passes into the intestine.
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