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65 Cards in this Set

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  • Back
A cavity within the body that is lined with tissues that arise from the mesoderm
animals that lack a coelom
have body cavities that are partially, but not completely lined with mesodermal tissues. Outside with mesoderm and inside with endoderm.
have body cavities that are completely lined with mesoderm.
have spiral cleavage, determinate cleavage, schizocloelous developmental patterns, mouth forms from the blastopore.
have radial cleavage, indeterminant cleavage, enterocoelous developmental pattern, and the anus forms from the blastopore
Phylum Chordata
notochord, dorsal hollow nerve cord, pharygeal slits, muscular tail
a sponge's central cavity
where the water enters the spongocoel through the walls
the larger hole through which the water exits the spongue.
lining in the ostia cells
collar cells, flagellated and create a current and filter food particles out of the water stream
serve as a type of endoskeleton for the spongue
free-swimming stage in the Phylum Cnidaria
stantionary stage of Cnidaria
nerve net
lacks specialized ganglia and brain
venomous, stinging organelles
cells where the nemotocysts are found.
two outer layers charactersitic of cnidaria
epidermis and gastrodermis, separated by the mesoglea
epitheliomuscular cells
column-shaped cells containing contractile fibers that allow the Hydra to control the length of its body and tentacles
interstitial cells
produce the sperm and eggs
oral disk
oral end of the body flares to form this structure on the metridium
pedal disk
at the aboral end and anchors the metridium and allows it to moove slowly
openings lined with cilia through which water is constantly flowing in and out of the gastrovascular cavity of the anenmoe.
the space between the epidermis and the gastrovascular lining is filled by this solid mass in acoelomates
opens into the internal gastrovascualr cavity
head region of the tapeworms
repeated segments of the tapeworm's body
wheel organ, that gathers food from the surrounding water for rotifers
grinds up food in the rotifer
two sections of the squid head region?
tentacles and a visceral humo with two lateral fins
what is the viceral hump is covered by?
the thick, muscular mantle
what are the types of tentacles?
four pairs of short tentacles of fixed length and one pair of much loner retractile tentacles that have pads of suckers at their tips.
what is the siphon?
the funnel-like structure in the mantle cavity that forces water through at a high pressure
what is the skin of the mantle covered with?
pigment cells called chromatophores
what the mantle primarily consist of?
circular muscule tissue
what prevents the water from moving backward through the siphon?
a muscular valve
what is the spermatophoric organ?
a sack-like structure in which the sperm is deposited
what are spermatophores?
the baseball-bat shaped structures where the sperm are packaged
what is the oviduct?
eggs produced in the ovary are discharged into the oviduct and secretes a gelatinous substance that suurounds the clusters of eggs.
what is the pen?
acts as a hard endoskeleton
what kind of circulatory system does hte suid have?
where are the two brachial hearts?
at the ends of the gills closest to the top of the mantle
what is the systematic heart?
the heart that receives the oxygenated blood, located between the two brachial hearts
what takes the blood to the rest of the body?
two large aortae
what is the function of the lens?
it separates the two fluid-filled chambers of the eye
what is in front of the lens?
the iris, which regulates that amount of light that enters the lens
what are the other parts of the eyes?
viterous humor, retina, pupil, photoreceptor cells, and optic nerves
what are metameres?
the repeated segments along the A-P axis in annelids
what is this type of segmentation?
metameric segmentation
what is the prostomium
the covering over the mouth at the anterior end
what is the clitellum?
several enlarged segments that form a swollen band about 1/3 body length from the anterior end.
what sex are earthworms?
what are setae?
bristle-like structures that help anchor the worm in the soil
how does the earthworm move?
peristaltic waves
what produces these contractions?
circular and longitudinal muscles
how many hearts does a worm have?
what are right next to the aortic loops?
the seminal vesicles
where does food first enter?
the buccal cavity
where does it go next?
the pharynx
what comes next?
the esophagus
the esophagus delivers the food to where?
the much wider crop, which acts as a storage chamber
what is next?
the hard and muscular gizzard
and next?
the intestine, where digestion and absorption takes place
what are castings?
feces of worms