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Chapter 27
Vocabulary
24
Biology
9th Grade
03/29/2010

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Term
acoelomate
Definition
animal lacking a coelom, or body cavity
Term
coelom
Definition
fluid-filled body cavity lined with mesoderm
Term
pharynx
Definition
muscular tube at the end of the gastrovascular cavity, or throat, that connects the mouth with the rest of the digestive tract and serves as a passageway for air and food
Term
flame cell
Definition
specialized cell that filters and removes excess water from the body of a flatworm
Term
ganglion
Definition
group of nerve cells
Term
eyespot
Definition
group of cells that can detect changes in the amount of light in the environment
Term
hermaphrodite
Definition
individual that has both male and female reproductive organs
Term
fission
Definition
form of asexual reproduction in which an organism splits in two, and each half grows new parts to become a complete organism
Term
scolex
Definition
head of an adult tapeworm; can contain suckers or hooks
Term
proglottid
Definition
one of the segments that make up most of a tapeworm’s body
Term
testis
Definition
male gonad that produces sperm
Term
pseudocoelom
Definition
body cavity between the endoderm and mesoderm tissues that is partially lined with mesoderm tissue
Term
anus
Definition
opening through which wastes leave the digestive tract
Term
closed circulatory system
Definition
system in which blood is contained within a network of blood vessels
Term
parapodia
Definition
paddlelike appendages used for swimming and crawling
Term
setae
Definition
bristles attached to the segments of many annelids
Term
radula
Definition
tongue-shaped structure used for feeding by snails and slugs
Term
siphon
Definition
tubelike structure through which water enters and leaves a mollusk’s body
Term
open circulatory system
Definition
system in which blood is not always contained within a network of blood vessels
Term
jet propulsion
Definition
drawing water into mantle cavity and then forcing water out through a siphon, propelling the mollusk in the opposite direction
Term
foot
Definition
muscular part of a mollusk, used for crawling, burrowing, capturing prey
Term
mantle
Definition
thin layer of tissue that covers most of a mollusk’s body
Term
shell
Definition
structure in mollusks made by glands in the mantle that secrete calcium carbonate
Term
visceral mass
Definition
area beneath the mantle of a mollusk that contains the internal organs
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