annelids (segmented worms)
what are three reasons having a segmented body is useful
1. Allows body parts to move independently of each other 2. Allows organisms to digest and move at the same time 3. allows organs to begin to specialize
the digestive track in an earthworm has how many openings?
2
which of the following is/are true about earthworms?
A) Earthworms return nutrients to the soil by decomposing dead organic matter. B) Burrows made by earthworms bring oxygen to plant roots and soil microorganisms D) Earthworms loosen the soil making it easier for roots to grow
do earthworms have specialized respiratory organs?
NO
setae
bristles in the ventral surface that provide traction
annelids have what type of coelom?
coelom
esophagus
connects the mouth and pharynx
Chitin is a tough carbohydrate found in earthworm
cuticle and setae
nephridia
excretory organs
earthworms have internal or external fertilization?
external
nephridia
filter wastes from body fluids
gizzard
grinds food
prostomium
helps dig through the soil
cocoon
holds fertilized eggs until young worms hatch
typhlosole
intestinal ridges increase the surface area for absorption
aortic arches
muscular structure to suck in food
pharynx
muscular structure to suck in food
cuticle
noncellular covering that prevents dehydration and protects
earthworms belong in what class of annelids?
oligochaeta
anus
opening where wastes leave
what class has fleshy projections called parapodia that aid in movement?
polychaetes
ovaries
produce eggs
clitellum
right around the body that makes mucous for reproduction
seminal receptacles store what
semen
clitellum
swollen band around earthworms
crop
temporarily stores food
hermaphrodites are organisms.....
that have both male and female reproductive organs
oligochaetes respire through what?
their moist skin
how do earthworms reproduce?
they are hermaphrodites but don't fertilize their own eggs.
setae has what function?
to aid in movement and gas exchange in some segmented worms.
why do earthworms need to stay moist?
to allow gases to diffuse through their skin
aortic arches
acts as earthworm's heart to pump blood
cerebral ganglia
acts as the earthworm's brain
setae
aid in movement
