invertebrate Flashcards
Invertebrate
animals without backbones
Exoskeleton
hard outer coverings that provide framework of support
Endoskeleton
internal skeletons
Vertebrate
has an endoskeleton and a backbone
Hermaphrodite
produces both sperm and eggs cells in the same animal body
Internal fertilization
occurs when sperm and egg cell combine inside the animal’s body
External fertilization
occurs when sperm and egg cells combine outside the animal’s body
Radial symmetry
can be divided along any plane through a central axis into roughly equal halves
Bilateral symmetry
can be divided into mirror image halves only along one plane through a central axis
Cephalization
the tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal
Coelom
fluid-filled body cavity that lines and encloses the organs
Pseudocoelom
body cavity lined partially with mesoderm
Acoelomate
animals that dont have a coelom
Protostome
the mouth develops first
Deuterostome
the anus develops first
Sessile
animals that are attached and stay in one place
Cnidocytes
nematocyst- containing stinging cells on a cnidarian’s tentacle
Ganglion
a group of nerve cell bodies that coordinates incoming and outgoing nerve signals
Regeneration
a process which body parts that are missing can be regrown
Hydrostatic skeleton
fluid within a closed space that provides rigid support for muscles to work against
Trichinosis
disease caused by eating raw or under cooked meat, usually pork, infected with trichinosis larvae
Open circulatory system
the blood is pumped out of vessels into open spaces surrounding the bod organs
Closed circulatory system
blood is confined to vessels as it moves through the body
Crop
sac in which food and soil are stored until they pass to the gizzard
Gizzard
muscular sac containing hard particles that help grind soil and food before they pass into the intestine
Clitellum
a thickened band of segments
Thorax
middle body region
Abdomen
contains fused segments at the posterior end, bear additional legs, digestive structure, and reproductive organs
Cephalothorax
structure formed from the thorax fused with the head
Molting
process of shedding the exoskeleton
Mandibles
a pair of appendages adapted for biting and chewing
Tracheal tubes
carries oxygen throughout the body
Book lungs
sac like pockets with highly folded walls for respiration
Spiracles
opening in the arthropod body through which air enters and waste gas leaves
Malpigian tubules
the wast-excreting structure that also helps maintain homeostatic water balance
