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HSE Zoology
Segmented Worms
52
Other
10th Grade
09/29/2010

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Term
Metamerism
Definition
segmentation
Term
What two types of muscles to segmented worms have?
Definition
circular and longitudinal
Term
Setae
Definition
bristles used for movement
Term
What type of body cavity do segmented worms have?
Definition
Coelom – true body cavity
Term
What type of circulatory system do segmented worms have?
Definition
closed
Term
What type of digestive system do segmented worms have?
Definition
Complete
Term
Segmented worm respiration?
Definition
skin, gills, or parapodia
Term
How many nephridia are there per segment?
Definition
1 pair
Term
What type of nervous system do segmented worms have?
Definition
advanced
Term
What type of sensory system do segmented worms have?
Definition
advanced
Term
What type of reproduction do segmented worms have?
Definition
monoecious or dioecious
Term
What is the class of marine worms?
Definition
polychaeta
Term
What is the class of earth worms?
Definition
oligochaeta
Term
To what class do leeches belong?
Definition
hirudinea
Term
Where do marine worms live?
Definition
Under rocks and in abandoned shells.
Term
What do marine worms build?
Definition
their own tubes or tunnels
Term
What are on the head of a marine worm?
Definition
sense organs and paired parapodia (appendages)
Term
What do marine worms use to obtain food?
Definition
cilia
Term
Marine worms have 5 types of sense organs. What are they?
Definition
Eyes
Tentacles
Sensory palps (antennae)
Chemoreceptive cells
Statocysts (balance)
Term
Trochophore
Definition
marine worm larvae
Term
What is an example of polychaeta (marine worm)?
Definition
Clam Worm
Term
Prostomium
Definition
lip
Term
What phylum do segmented worms belong to?
Definition
Annelida
Term
Clitellum
Definition
Band 1/3 way down an earth worm's body,secretes cocoon
Term
Peristaltic movement
Definition
wave like contractions
Circular muscles lengthen
Longitudinal muscles shorten
Term
What do earth worms eat?
Definition
decayed organic matter
Term
Name the 7 parts of the earth worm digestive tract.
Definition
Step 1: Mouth
Step 2: Pharynx
Step 3: Esophagus
Step 4: Crop (stores food)
Step 5: Gizzard (grinds food)
Step 6: Intestine
Step 7: Anus
Term
Typhlosole
Definition
folding of intestine (creates more surface area)
Term
Calciferous glands
Definition
secrete calcium ions into the gut to regulate the amount of calcium in the blood
Term
How much of the earth worm digestive tract is intestine?
Definition
2/3
Term
What does the dorsal blood vessel in an earth worm do?
Definition
Returns blood back to the anterior portion
Term
Where is the heart found in an earth worm?
Definition
over the esophagus (aortic arches)
Term
What blood vessel is opposite the dorsal blood vessel in an earth worm?
Definition
The ventral blood vessel
Term
hemoglobin
Definition
pigment in earth worm blood
Term
How does an earth worm and leech breathe?
Definition
Through its moist skin
Term
nephridia
Definition
Used for excretion in earth worms. There are 2 per segment.
Term
Nephrostome
Definition
funnel shaped organ (receives waste)
Term
Nephric tubules
Definition
surround blood vessels (remove waste from blood)
Term
Nephridiopore
Definition
opening to exterior through which waste passes
Term
What does an earth worm produce as waste?
Definition
Ammonia
Term
Osmoregulation
Definition
Regulation of water and salt using the skin and nephridia
Term
What segment is the brain in in an earth worm?
Definition
3rd
Term
Ganglia
Definition
masses of tissue containing nerve cells
Term
What kind of receptors do earth worms have in their skin?
Definition
photoreceptors and chemoreceptors
Term
Can earth worms and leeches sense touch?
Definition
Yes
Term
Where are earth worm eggs fertilized?
Definition
In a cocoon, smaller than a grain of rice.
Term
What class do leeches belong to?
Definition
Hirudinea
Term
How many suckers and brains do leeches have?
Definition
2 of each
Term
Where are the suckers and brains on leeches located?
Definition
Anterior and posterior
Term
What does a leech eat?
Definition
Blood
Term
What are the parts of a leech's digestive tract?
Definition
mouth, proboscis, intestine, cecum, anus
Term
Are leeches monoecious or dioecious or both?
Definition
monoecious
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