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IGHS Winkels

Zoology Chapter 27

TermDefinition
acoelomates "without coelom"
coelom a fluid-filled coelom forms between the tissues of flatworms
pharynx a muscular tube near the mouth
flame cells specialized cells that remove excess water such as ammonia and urea
ganglia a group of nerve cells that control the nervous system
eyespot a group of cells that can detect changes in the amount of light in their(flatworms) environment
hermaphrodite is an individual that has both male and female reproductive organs
fission an organism splits in two, and each half grows new parts to become a complete organism
scolex the head of an adult tapeworm
proglottids the segments that make up most of the worm's body
testes male reproductive organs
pseudocoelom body cavity is lined only partially with tissue derived from the mesoderm
anus the posterior opening of the digestive tract
septa internal walls between each segment of an annelid body
setae bristles that are attached to each body segment
crop part of the digestive tract where food is stored
gizzard part of the digestive tract where food is ground into smaller pieces
closed circulatory system blood is contained within a network of blood vessels
gill an organ specialized for the exchange of gases underwater
nephridia the excretory organ that filter fluid in the coelom
clitiellum a band of thickened, specialized sements, secretes a mucus ring into which eggs and sperm are released
trochophore free-swimming larval stage of many aquatic mollusks
foot takes many forms in a mollusks including flat, spade-shaped burrowing, and tentacles for capturing prey
mantle thin layer of tissue that covers most of the mollusk's body
shell made by glands in the mantle that secrete calcium carbonate
visceral mass located just below the mantle, consists of the internal organs
radula a flexible tongue-shaped structure used for feeding in slugs and snails
siphon tubelike structure through which water enters and leaves the body of a mollusk
open circulatory system blood is pumped through vessels by a simple heart
Created by: Winkels