platyhelminthes: parasitic flatworms Flashcards
name two parasitic flatworms
flukes, tapeworms
what is on the anterior end?
Carries suckers and sometimes hooks to attach
describe how they infect people?
- utilize a secondary host to carry a sexually immature parasite.
- primary host is infected once maturity is reached and it starts reproducing.
- eggs are passed through feces and hatch, and the cycle continues
what is on the anterior end of flukes
surrounded by sensory papilla
- oral sucker
- sucker for attachment to host
what body shape do flukes have
oval to elongate
what do flukes infect
digestive tract, bile duct, blood and lungs
schistosomes are blood flukes that enter the body through what process and what sickness do they cause?
Active penetration
- schistomiasis
schistomiasis is predominantly in
middle East, Asia, Africa, South America
schistomiasis is predominantly in egypt due to
standing water in irrigation ditches, unsanitary practises, Aswan dam favours snail growth
tapeworms attach to which body part
intestinal wall
do tapeworms have a digestive system?how are nutrients absorbed?
no. nutrients absorbed through skin
what is the tegument in tapeworms?
specialized body wall resistant to the host’s digestive juices
what does the tegument in flukes do?
prevents digestion, absorbs nutrients from host, facilitates excretion, and gas exchange
what is the tegument covered by?
glycocalyx: mucopolysaccharide coating
describe the reproductive system of a tapeworm
extensively developed
- producing millions of eggs
- compensates for difficulty dispersing offspring
describe the anterior region of tapeworms
Scolex: hooks and suckers to attach to intestinal wall
what is a proglottid?
- tapeworms have a long series of proglottids behind their scolex
segments that contain full sets of male and female sex organs
what is inside a mature proglottid?
bags full of eggs
after burrowing through the intestinal wall and travelling in the blood, what do proglottids do
encyst in muscle
tapeworms are endoparasites. describe an endoparasite
lives in tissues and organs
