Section 21.4- Annelids: Segmented Worms

Question 1

three phyla of worm and wormlike animals

Answer 1

segmented worms
flatworms
roundworms

Question 2

include earthworms, sea worms, and leeches

have cylindrical bodies that are divided into consecutive ring-like segments

Answer 2

segmented worms (Annelids)

Question 3

inside most annelids, each segment is separated from the next by a dividing wall called a

Answer 3

septum

Question 4

a typical annelid that makes a fine specimen to study

Answer 4

earthworm

Question 5

earthworms have four pair of ________________, or bristles,

helps with movement

Answer 5

setae

Question 6

permits direct exchange of gases with the air

Answer 6

earthworm’s smooth skin

Question 7

If soil dried out, earthworm will die of ______________

if heavy rain, earthworm must go to top or _____________

Answer 7

suffocation

drown

Question 8

consists of nerves, a nerve cord, and a tiny brain

Answer 8

earthworm’s nervouse system

Question 9

the earthworm’s circulatory system consists of

Answer 9

red blood
two large blood vessels
two smaller connecting blood vessels in each body segment
ten hearts, or aortic arches,,

Question 10

the shovel-like upper lip of an earthworm that scoops soil into the mouth

Answer 10

prostomium

Question 11

digestive tract of an earthworm

Answer 11

pharynx
esophagus
crop
gizzard
intestine

Question 12

temporary storage of earthworm’s food

Answer 12

crop

Question 13

a thick-walled muscular structure that grinds food into fine particles

Answer 13

gizzard

Question 14

liquid wastes are eliminated from the earthworm’s body by

coiled tubes that are open at both ends and function like tiny kidneys

Answer 14

nephridia

Question 15

the largest class of segmented worms, but are not well known

Answer 15

sea worms

Question 16

fleshy lobes in all sea worms that assist in the movement and in the exchange of oxygen and carbon dioxide in a sea worm

Answer 16

parapodia

Question 17

annelids that do not have setae or parapodia

Answer 17

leeches

Question 18

leeches have flattened bodies with one __________________ at each end of their body

Answer 18

suction disk

Question 19

substance in leech’s saliva that keeps the blood flowing in an animal even after latching one

Answer 19

anticoagulant