nematoda Flashcards
1
Q
what kind of symmetry
A
bilateral
2
Q
what kind of body plan
A
tube within a tube
3
Q
what level of organization
A
organ level
4
Q
what do they have to excrete
A
excretory pores
5
Q
describe their outer wall
A
non-segmented: smooth
6
Q
what do they do for respiration
A
diffusion
7
Q
what kind of digestive tract
A
complete: mouth and anus
8
Q
what kind of coelom? describe advantages, what it provides
A
psuedocoelom (fluid filled)
- body cav incompletely lined with mesoderm
- Provides space for development of organs
- circulatory system: easy passage of molecules
- Hydrostatic skeleton
9
Q
do most have separate sexes?
A
yes
10
Q
fertilization is _____
A
internal
11
Q
how many germ layers
A
three
12
Q
in species ascaris, which sex is larger
A
females
13
Q
what kind of motion used to move and why
A
whiplike motion: due to only having longitudinal muscles
14
Q
life will begin when…
A
larvae within a protective covering are swallowed
15
Q
describe the journey of a roundworm in a host
A
- Escape through the covering, burrow through the host’s intestinal wall
- Through the organs: Intestine, liver, 💕, lungs
- Up the windpipe to be swallowed to intestine
- Produces larva-containing eggs, out with feces
