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68 Cards in this Set

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Cnidocyte
specialized stinging cells that assists in prey capture and defense; most concentrated in tentacles and hypostome
Polyp
sessile form with oral surface up and aboral surface attached to substrate
Medusa
free swimming form with mouth downward
Dimorphic
having both forms of life cycle
Nematocysts
capsules discharged from cnidocytes triggered by cnidocils
Hypostome
conical elevation with mouth opening at its tip
Tentacles
food catching arms that radiate from the hypostome
Gastrovascular cavity
location where digestion and absorption of food occurs; some gas exchange also occurs here in the cells lining the cavity
Mesoglea
thin, gelatinous layer between epidermis and gastrodermis; provides support as the hydrostatic skeleton
Epitheliomuscular cells
act as epithelial and muscular cells; longitudinal found in epidermis; circular found in gastrodermis (hydra)
Cnidocils
projections on the outer surface of the cnidocyte; modified epidermal cilia
Gland cells
located in epidermis of basal disc; secrete a sticky substance used in anchorage to substrate; also in gastrodermis to secrete digestive enzymes
Interstitial cells
between epitheliomuscular cells; totipotent - act like stem cells
Bell
dome-shaped structure composed of epidermis, gastrodermis, and mesoglea
Tentacular bulbs
swellings at the base of each tentacle; contain interstitial cells which will develop into cnidocytes
Adhesive pads
near tip of tentacles; used in attachment
Velum
shelf under edge of bell; used in movement
Manubrium
tube that hangs in space inside the bell; connected to stomach
Stomach (gonionemus)
site of extracellular digestion
Oral lobes
assist with ingestion
Radial canals
extensions of the stomach
ring canal
connects ends of radial canals; stomach and canals form a continuous gastrovascular system where food is partially digested and circulated; food engulfed by cells of gastrodermis and digestion is completed intracellularly
Statocysts
swellings between the bases of tentacles; contain stones suspended on a stalk; used for orientation with respect to gravity
Planula
ciliated larva developed from zygote
function of mucus in the worm
protective layer for worm; also used for locomotion and respiration
Prostomium
fleshy lobe that precedes mouth
Seminal Receptacles
used to store mate's sperm
Female genital pores
where eggs are released
Male genital pores
where sperm are released
Genital setae
help hold ventral surfaces of partners together during copulation
Clitellum
secretes a mucus cocoon in which eggs and sperm are deposited
Coelom
fluid-filled body cavity
Pharynx
pulls soil and detritus into digestive tract
Crop
storage pouch
Gizzard
grinds up food
Intestine
digestible food materials and water are absorbed into blood
typhlosole
dorsal infolding of the intestine; increases the area of absorption of the intestine
Seminal vesicles
storage of worm's own sperm
Testes
produce sperm
Ovaries
produce eggs
Dorsal blood vessel
carries blood anteriorly towards aortic arches
Aortic arches
main pumping organs; send blood to ventral blood vessel
Ventral blood vessel
carries blood posteriorly
Epidermis (worm)
where gas exchange occurs
Suprapharyngeal ganglia
main center for coordination of sensory and motor functions
Clitellum
secretes a mucus cocoon in which eggs and sperm are deposited
Coelom
fluid-filled body cavity
Pharynx
pulls soil and detritus into digestive tract
Clitellum
secretes a mucus cocoon in which eggs and sperm are deposited
Crop
storage pouch
Coelom
fluid-filled body cavity
Gizzard
grinds up food
Pharynx
pulls soil and detritus into digestive tract
Intestine
digestible food materials and water are absorbed into blood
typhlosole
dorsal infolding of the intestine; increases the area of absorption of the intestine
Seminal vesicles
storage of worm's own sperm
Intestine
digestible food materials and water are absorbed into blood
Testes
produce sperm
Ovaries
produce eggs
Dorsal blood vessel
carries blood anteriorly towards aortic arches
Seminal vesicles
storage of worm's own sperm
Aortic arches
main pumping organs; send blood to ventral blood vessel
Ventral blood vessel
carries blood posteriorly
Epidermis (worm)
where gas exchange occurs
Suprapharyngeal ganglia
main center for coordination of sensory and motor functions
Epidermis (worm)
where gas exchange occurs
Segmental ganglia
coordinate muscular contractions of the body wall
Nephridium
picks up chemicals from coelomic fluid and from blood capillaries and excretes these wastes through the nephridiopore