Terminology Flashcards
Cnidoblast
Specialized cells that contain a secretory organelle.
Nematocyst
Long coiled thread that shoots out and injects toxins into the prey.
Sessile
Attached to a substrate
Polyp
Body shape that is attached to a substrate
Medusa
Body shape that is upside down and free floating.
Radial Symmetry
Arranged around single main axis divided into 4 halves
Bilateral Symmetry
Arranged along central axis cut into 2 halves
Incomplete Gut
Contains 1 hole for mouth and anus
Complete Gut
Contains 2 holes 1 for mouth, 1 for anus
Pseudocoelom
False Body found between outer body wall & the digestive tube.
Coelom
A fluid filled body cavity found between layers of mesoderm.
Exoskeleton
A hard protective body
Chitin
A fibrous substance consisting of polysacarides
Mandibles
Jaw bones to chew food
Mantle
A soft unsegmented body & often containing a shell
Open Circulatory System
No True Heart. Fluids flow freely throughout the body
Notochord
Flexible supporting rod that runs the length of the body. Dorsal digestive tract replaced by vertebral column in vertebrates.
Dorsal Hollow Nerve Tube
Develops into the central nervous system: the brain and spine by which cerebrospinal fluid passes.
Pharyngeal Gill Slits/Pouches
Animals have gill slits and humans have pouches.
Ectothermic
Animals whose regulation of body temperature depends on external sources, such as sunlight or a heated rock surface
Endothermic
Animals that maintain a constant body temperature independent of the environment.
Tissue
Consists of a group of structurally and functionally similar cells and their intercellular material
Organ
A group of tissues in a living organism that have been adapted to perform a specific function. In higher animals, organs are grouped into organ systems
Organ System
A group of anatomical structures that work together to perform a specific function or task
