Lesson 19 Terms Flashcards
Annelida
segmented worms
Amebocytes
cells in a sponge that perform digestion and transport functions
Phylum Arthropoda
insects, lobsters, spiders
Asymmetrical
animals with no symmetry- phylum porifera
Bilateral symmetry
organisms can be divided through the center to create mirror images
Blastula
a hollow ball of cells
Chordata
fish, birds, animals, reptiles
Cleavage
when a single cell is converted to a multicellular zygote
Cnidaira
jellyfish and sea anemones
Collar cells
line the inside of the sponge’s hollow sac-like body; appear to have a collar, with flagella that extend from the collar
Echinodermata
sea stars and sea urchins
Ectoderm
outside layer
Ectothermic
body temperature rises and falls with the temperature of the surrounding environment
Endoderm
inside layer
Endoskeleton
an internal skeleton made up of plates called ossicles
Endothermic
use energy from cellular respiration to keep warm
Exoskeleton
plated outer covering
Gastrulation
occurs when cells move inside the blastula and form multiple layers of cells called germ layers
Germ layers
multiple layers of cells: ectoderm, mesoderm, endoderm
Hermaphroditic
having both male and female reproductive organs that produce both sperm and eggs
Hydroskeleton
fluid-filled compartment in the body
Invertebrates
animals that don’t have backbones
Invertebrates
animals that don’t have backbones
Mesenchyme
the jellylike substance that separates the epidermis from the inner cells in a sponge
Mesoderm
the middle germ layer which will form the circulatory system, muscle, and bones
Mollusca
clams, snails, and squids
Motile
capable of movement
Nematoda
roundworms
Platyhelminthes
flatworms
Platyhelminthes
flatworms
Porifera
sponges
Radial symmetry
organism can be divided in many different ways to form mirror images
Sessile
an organism that does not move
Spicules
a network support system made of lime or silica with a hard spiny feel
Spongin
a web of protein with a soft feel
Vertebrates
animals that have backbones
