Ch.18 - Pseudocoelomate Animals Flashcards
what are the general characteristics of phylum nematoda?
- psuedocoelomate
- triploblastic
- complete digestive system
- dioecious
what is the common name for phylum nematoda?
roundworms
what are the characteristics of pseudocoelomates?
- gut surrounded by a second cavity
- not lined with mesoderm
- coelom
what are the advantages of a coelom?
- more space
- greater surface area
- flexibility
- hydrostatic support
what does dioecious?
two individuals with two different sexes
Roundworms only have _____ muscles.
longitudinal
what does the fluid filled coelom do?
forms a hydrostatic skeleton
what is the life cycle of large roundworm?
eggs shed with feces -> ingested (by plants, soil, hands) -> juveniles burrow from intestine to circulatory system -> carried to lungs (mature) -> up bronchi/trachea, swallowed to intestine
what are the symptoms of large roundworm?
usually none; abdominal pain, intestinal blockage
how do you prevent large roundworms being eaten?
clean and cook plants + wash hands
what is the life cycle of hookworms?
eggs in feces -> hatch -> feed on soil bacteria -> penetrate skin to blood then lungs (mature) -> move to intestine via throat -> rasp inside of large intestine -> suck blood
what are the symptoms of hookworms?
anemia, fatigue, can cause physical and mental retardation in children
how do you prevent/control hookworms?
wear shoes
what is the life cycle of pinworms?
adult females migrate from small intestine to anus to lay eggs -> resultant itch
what are the symptoms of pinworms?
itching
how do you control pinworms?
drugs
what is the life cycle of trichinella worms?
ingestion of undercooked pork -> larvae released -> mature -> live in small intestine -> produces new larvae -> form cyst in muscle
what are the symptoms of trichinella worms?
nausea, vomiting, sweating, diarrhea
how do you control trichinella worms?
cook meat
where do dog heartworms live?
juvenile -> in blood
adults -> in heart
what transmits dog heartworm?
misquitoes
what produces elephantiasis?
filarial worms
what is elephantiasis?
swelling in lymph system
what are helminth worms?
a general term used to describe worm-like animals that are parasitic (= tapeworms, flukes, and many roundworms)
what is helminthic therapy?
parasites might help immune system cope with immune-mediated diseases such as hay fever, asthma, MS
what is the common name of phylum rotifera?
rotifers
what are the 4 characteristics of rotifers?
1) most freshwater
2) ciliated mouth -> feeding and locomotion
3) trunk “segmented”
4) foot with toes anchors
