chapter 36-2 Flashcards
trichinosis
human disease caused by eating under-cooked meat containing cysts of the “Trichinella” worm
Filarial worm
parasite roundworm that causes diseases such as elephantiasis in humans and heartworms in dogs
mastax
muscular organ that breaks up food in a rotifer
pseudocoelomates have a hollow,fluid filled cavity that is
lined by mesoderm on the outside and endoderm on the inside
the roundworm digestive tract
has two openings
ascaris eggs enter the body of a human host when the
host ingests contaminated food or water
hookworms normally reach the human intestine after they
travel through the blood to the lungs and throat and are then swallowed
a rotifer’s excretory system includes
flame cells and excretory tubules
what insect carries the roundworm that causes elephantiasis
mosquito
what structure on a rotifer looks like a pair of rotating wheels
the crown of cilia
what is the function of the crown of cilia on a rotifer
sweeps food into the digestive tract
what advantage does a digestive tract have over a gastrovascular cavity
Food moves through a digestive tract in only one
direction, which allows different parts of the tract
to carry out different functions.
compare the sites where eggs hatch in the life cycles of Ascaris, hookworms, and pinworms
Ascaris eggs and pinworm eggs hatch in the intestine;
hookworm eggs hatch in warm, damp soil.
most roundworms that parasitize the digestive tract live in the small intestine, which is close to the stomach. What is the adaptive advantage of living in the small intestine for a worm that does not feed directly on its host’s tissues.
The small intestine often contains undigested and
partially digested food on which the worm can feed.
