wiggly worms (and parasitic ones)

closed circulatory system

closed circulatory system

blood flow is contained in vessels

coelem

body cavity

crop

one of a two-part stomach situation where food is stored

diffusion

movement of particles from an area of high to low concentration

flame cell

cells in flatworms that filter and remove excess water, urea, and ammonia

flatworm

soft, flat, unsegmented acoelmate worms with no anus. planarians, flukes, tapeworms

flukes

the largest class of flatworms, parasitic

ganglia

groups of nerve cells that control the nervous system; two long nerve cords with short ones b/n, like a ladder

gills

filamentous organ that is specialized for gas exchange

leeches

parasitic annelids without setae or paraodia; only member of class hirudinea

nephridia

excretory organs that filter fluid

parapodia

fleshy, paddle-like appendages that are sometimes accompanied by setae. used to swim, burrow, or crawl

parasite

an organism that lives off another organism, causing harm

endoparasite v ectoparasite

one type has a tegument coating to prevent from being digested and lives w/in an organism. the other lives on the outside of its host

pharynx

accompanied by the mouth and acts like a pump that moves food through the gastrointestinal cavity

proglottid

repeating reproductive sections on a tapeworm that make up its body

proboscis

extendable tubular sucking organ

pinworms

parasitic flatworm that causes oxyuriasis, or__________ infection that causes itching around the anus resulting from the female having laid her eggs

roundworms

also known as nematodes, these are unsegmented worms with specialized tissues and organ systems and two digestive openings: mouth and anus

setae

tiny, hair-like structures for traction

scavengers

those that feed upon recently dead organisms

schistosomiasis

a disease caused by flukes found in snail and humans where the eggs of the worm block blood vessels, causing swelling and tissue decay in the lungs, liver, spleen, or intestines

tapeworms

intestinal parasitic flatworms, class cestoda, that lack a digestive system and absorb nutrients from the host; composed of proglottids, or repeating sections. hermaphrodites

tegument

a protective coating around endoparasites that prevents them from being digested

trichinosis causing worms

complete their life cycle only when another animal eats muscle tissue containing their cysts

filarial worms

transmitted to humans by mosquitos

ascarid worms

causes malnutrition, spread by eating food that isn’t properly washed

ascarsis, hookworms

use sharp teethlike structures to enter the unprotected feet of a host