Roundworms

Williams, Zach
4th period
Mr.collins
Roundworms

1. 27-2 27-2
RoundwormsRoundworms
Zach WilliamsZach Williams
Mr.CollinsMr.Collins
44
thth
period period
3-29-20103-29-2010

2. What is a Roundworm?What is a Roundworm?
A Roundworm or Nematode has a "tube" like A Roundworm or Nematode has a "tube" like
body within a tube, with a fluid- filled cavity in body within a tube, with a fluid- filled cavity in
between the tubes. between the tubes.
Most nematodes are parasites, such as ascarids, Most nematodes are parasites, such as ascarids,
filarids, pinworms, hookworms, and whipworms. filarids, pinworms, hookworms, and whipworms.
The infection is a disease of the digestive tract, The infection is a disease of the digestive tract,
which is caused parasitic worms known as which is caused parasitic worms known as
nematodes. nematodes.

3. Form & Function…Form & Function…
Many roundworms are free-living & carnivores. Many roundworms are free-living & carnivores.
They use mouthparts and spines to catch and They use mouthparts and spines to catch and
eat other small animals. eat other small animals.
They exchange gasses and excrete metabolic They exchange gasses and excrete metabolic
waste through their body walls. They have no waste through their body walls. They have no
internal transport system. Therefore, they internal transport system. Therefore, they
depend on diffusion to carry nutrients and waste depend on diffusion to carry nutrients and waste
through their bodies.through their bodies.

4. ……Form & FunctionForm & Function
They have a simple nerve system, consisting of They have a simple nerve system, consisting of
several ganglia. These nerves transmit sensory several ganglia. These nerves transmit sensory
image and control how they move. It also can image and control how they move. It also can
sense chemicals given off by dead organisms or sense chemicals given off by dead organisms or
hosts.hosts.
They have muscles that run the length of the They have muscles that run the length of the
body. There muscles act as a hydrostatic body. There muscles act as a hydrostatic
skeleton They move like snakes through the skeleton They move like snakes through the
water & just push their way through the soil.water & just push their way through the soil.

5. DiseaseDisease
These worms cause a great deal of pain and These worms cause a great deal of pain and
suffering in humans. Most round-worms are suffering in humans. Most round-worms are
free-living, but they’re better known to parasite free-living, but they’re better known to parasite
their hosts. their hosts.
Roundworms can cause elephantitis & blindness.Roundworms can cause elephantitis & blindness.

7. Bibliography Bibliography
Miller, Kenneth R., and Joseph S. Levine. Miller, Kenneth R., and Joseph S. Levine.
Prentice Hall BiologyPrentice Hall Biology. Upper Saddle River, . Upper Saddle River,
N.J.: Prentice Hall, 2002. Print.N.J.: Prentice Hall, 2002. Print.
"Nematode -." "Nematode -." Wikipedia, the Free Wikipedia, the Free
EncyclopediaEncyclopedia. Web. 31 Mar. 2010. . Web. 31 Mar. 2010.
<http://en.wikipedia.org/wiki/Nematode>.<http://en.wikipedia.org/wiki/Nematode>.