Mollusks

Vocabulary Words

  • · Mantle- covers the body organs, which are located in the visceral mass

    · Mantle Cavity- between the soft body and the mantle, contains gills

    · Gills- organs in which carbon dioxide from the mollusk is exchanged for oxygen in the water

    · Inside Layer- (of the shell)- smoothest and usually the thickest layer because it’s added to throughout the life of the mollusk; also protects the soft body

    · Open Circulatory System- when the heart moves blood out into the open spaces around the body organs

    · Gastropods- largest group of mollusks.  This classified group includes: abalones, whelks, sea slugs, garden slugs, and conchs.  Sometimes called univalves

    · Bivalves- mollusks that have a hinged, two-part shell joined by strong muscles.  This classified group includes: clams, oysters, and scallops

    ·  Cephalopod- “head-footed” and describes the body structure of these invertebrates: cuttlefish, squids, and octopuses.  All are predators too

    · Radula- a tongue like organ with rows of teeth to obtain food used by gastropods

    · Closed Circulatory System- blood containing food and oxygen moves through the body in a series of closed vessels; only cephalopods use this system

    · Newton’s Third Law of Motion- when one object exerts a force on a second object, the second objects exerts a force on the first that is equal and opposite in direction 
    _Cuttlebone- it is the internalshell of a cuttlefish.
    Shipworms- it is a type of bivalve they eat holes in the bottom of boats docks and piece of wood