Section 27 Vocab Flashcards
Acoelomate
Animal lacking a coelom, or body cavity
Pharynx
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
Flame cell
Specialized cell that filters and removes excess water from the body of a flatworm
Ganglion
Group of nerve cells
Eyespot
Group of cells that can detect changes in the amount of light in the envoirment
Hermaphrodite
Individual that has both male and female reproductive organs
Fission
Form of asexual reproduction in which an organism splits into two, and each half grows new parts to become a complete organism
Scolex
Head of an adult tapeworm; can contain suckers or hooks
Proglottid
One of the segments that make up most of a tapeworms body
Testis
Male reproductive organs that produces sperm
Pseudocoelom
Body cavity between the endoderm and mesoderm tissues that is partially lined with mesoderm tissue
Anus
Opening through which wastes leave the digestive tract
Septum
Internal wall between the segments of an annelids body
Crop
In earthworms, part of the digestive system in which food can be stored; in birds, structure at the lower end of the esophagus in which food is stored and moistened
Closed circulatory system
System in which blood is contained within a network of blood vessels
Seta
Bristle attached to the segments of many annelids
Gizzard
In earthworms, part of the digestive system in which food is ground into smaller pieces; in birds a muscular organ that helps mechanical break down of food
Gill
Filamentous organ in aquatic animals specialized for the exchange of gases with water
Coelom
Fluid filled body cavity lined with mesoderm
Nephridium
Excretory organ of an annelid that filters fluid in the coelom
Clitellum
Band of thickened, specialized segments in annelids that secretes a mucous ring into which eggs and sperm are released
Trochophore
Free swimming larval stage of aquatic mollusk
Foot
Muscular part of a mullusk
Mantle
Thin layer of tissue that covers most of a mollusks body
Shell
Structure in mollusks made by glands in the mantle that secrete calcium carbonate
Visceral mass
Area beneath the mantle of a mollusk that contains the internal organs
Radula
Tougne shaped structure used for feeding by snails and slugs
Siphon
Tubelike structure through which water enters and leaves the mollusks body
Open circulatory system
System in which blood is not always contained within a network of blood vessels
