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40 Cards in this Set

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  • Back
the property of symmetry about an axis as demonstrated by starfish
radial symmetry
left and right sides are mirror images in this form of symmetry
bilateral symmetry
attached to a substrate or unable to move
sessile
capable of self-propelled movement
motile
having both male and female reproductive organs
hermaphrodite
a form of animal sexual reproduction in which a sperm cell is united with an egg cell within the body of the female of the species
internal fertilization
a method of reproduction most common in aquatic organisms during which the gametes (egg and sperm) unite outside the body
external fertilization
the evolutionary process by which sensory organs move to the head region
cephalization
of or near the head end or toward the front plane of the body
anterior
The back of the body or situated nearer the back of the body
posterior
refers to the back of an organism
dorsal
toward the front of the body
ventral
the state of extreme dryness, or the process of extreme drying
dessication
The internal structure or skeleton
endoskeleton
An external protective or supportive covering
exoskeleton
the substance aquatic organisms rely on but takes a lot of water to dissolve
ammonia
both ideal substances for excretion because each is dissolved easily by water
urea and uric acid
tubes that waste water passes through that recover essential salts lost during excretion
nephridia
as surface area increases volume does what? what eventually happens to the ratio between the two?
it increases as well so eventually the ratio gets smaller
A specialized network of vessels for the circulation of fluids throughout the body tissue of an animal
vascular system
Fluid-filled cavity within the body of an animal
coelom
An early stage in the development of a fertilized egg
zygote
an embryo at the stage of development in which it consists of usually one layer of cells around a central cavity, forming a hollow sphere
blastula
the fluid-filled cavity inside a blastula
blastocoel
an opening into the archenteron during the embryonic stages of an organism
blastopore
area that forms guts and internal organs
endoderm
area that forms skeleton and muscles
mesoderm
area that forms the epidermis and nervous system
ectoderm
Body lacks a coelom, solid except for crude internal pouch or GVC
Acoelomate
Coelom is actually a fluid-filled remnant of the blastocoel
pseudocoelomate
Coelom is formed from the mesoderm, and lined by mesodermal membranes
eucoelomate
in this type of organism, the blastopore becomes the mouth, anus opens opposite the mouth later on
protostome
the type of division that takes place in the development of a protostome embryo
spiral cleavage
protostomes possess _________ cells in which the cell's fate is set earbly on
determinate
protosomes also possess ________ where the coelom forms as a split in the mesoderm
schizocoels
in this type of organism, the blastopore becomes the anus, mouth opens opposite the anus later on
deuterostome
this type of division takes place in the development of a deuterostome embryo
radial cleavage
deuterostomes possess ______ cells in which the cell's fate is not set early on
indeterminate
deuterostomes possess _______ as their coelomic body plan
enterocoels
the body's shape is maintained by an incompressible fluid
hydrostatic skeleton