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tutorial lab 3

what type of symmetry does phylum cnidaria have

radial symmetry

what body cavity do cnidarians have

gastrovascular cavity

stinging structures used to immobilize prey by cnidarians

nematocysts

mature cnidarians have how many cellular layers

2

what cell layers do cnidarians have

epidermis and a gastrodermis

diploblastic organisms

have 2 cellular layers

layer between the epidermis and gastrodermis in cnidarians

mesoderm (non cellular)

mesoderm allows animals to be

more organised in their stucture

triploblastic organisms

have three germ layers of cells

two forms of cnidarian

polyp and medusa

polyp

form of cnidarians that is tubular and closed at one end with a mouth surrounded by tentacles at the other end

medusa

form of cnidarian. umbrella shaped jelly-like free-swimming organism with a mouth at the end of a central projection called a manubrium

cnidarians do not require which systems

respiratory or circulatory
because the entire body surface participates in gas exchange and no cell is ever far enough away from the source to need anything more complex

hydra reproduce

asexually (budding) and sexually (sperm and ova)

gametes in hydra are produced in

spermaries and ovaries

obelia reproduces ___

alternation between polyp (asexual generation) and medusa (sexual generation)

club shaped polyps of obelia (cnidaria)

reproductive

polyps posessing tentacles on obelia (cnidarian)

nutritive polyps

perisarc surrounding the reproductive polyps

gonothecae

perisarc surrounding the nutritive polyps

hydrothecae

medusa tentacles contain

stinging cnidocytes with nematocysts inside them

manubrium in medusa

extends into the cavity and contains a mouth at its tip surrounded by four oral lobes

phylum Platyhelminthes

flatworms, dor0-ventrally flattened, bilaterally symmetrical, triploblastic

platyhelminthes are ___ blastic

triplo

germ layers flatworms posess

epidermis gastrodermis, layer of parenchyma developed from embryonic mesoderm

body plan of flat worms

acoelomate

dugesia

flatworm

dugesia has ___ digestive tract

a blind

Platyhelminthes have a ___ complex digestive tract that cnidarians

more

branches of the digestive tract are useful because

they increase the surface area for apsorbtion

food is brought to the gastrovascular cavity through __ in planaria

a muscular pharynx

clonorchis sinensis

flatworm that lives in the bile ducts of the human liver

clonorchis sinensis have a muscular pharynx leading to a blind digestive tract

true but the muscular pharynx is not protrusible

has an anterior mouth located at the bottom of a muscular sucker

clonorchis sinensis

oral sucker

used to suck in tissue fluids

free living flat worms have ___ excretory system

discrete

flame cells in flat worms

long cilia located at the blind end of the tubules within the body

function of flame cells

propel excess water through the tubules of the osmoregulation system in free-living flatworms

gastrovasular system in flat worms

transports nutrient materials

if gastrovascular system is not present in flatworms, internal transport occurs via

diffusion

planarians have either female or male sex organs

false they are hermaphroditic

musculature of ascaris sp contains what muscle

longitudinal only that work simultaneously against the fluid in the psudocoelom

peritoneum

thin epithelial lining separating the body cavity from the body wall

intestine infolding in annelids

typhlosole

cells surrounding the exterior surface of the intestine in annelids

chloragogue cells

function of chloragogue cells

an accessory digestive gland, the site of glycogen synthesis deamination of proteins and production of ammonia and urea

nephridia

within the coelom between the intestine and the body wall appearing as wavy lines

terrestrial arthropods tracheal system

spiracles lead to tubules (tracheae), branch into fine tubules (tracheoles) reach groups of cells in the body
provides large surface for respiratory exchange

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