Phylum Annelida

Question 1

General characteristics

Answer 1

segmented
permits specialization
complete digestive track
bilateral symmetry
true coelom
3 germ layers

Question 2

Advances over Nematodes

Answer 2

segmented
true coelom
more organs in the body cavity

Question 3

classes and examples

Answer 3

oligochaeta-earthworms

polychaeta- marine worms( paired, paddle like appendages on each segment

Question 4

digestion/feeding, digestion organ pathway

Answer 4

mouth-pharynx-esophagus-crop-gizzard-intestine-anus

Question 5

mouth function

Answer 5

start of digestive pathway

Question 6

Pharynx

Answer 6

contracts and swallows food and dirt

pumps food and soil into esophagus

Question 7

Esophagus

Answer 7

food tube (contacts)

Question 8

Crop

Answer 8

stores food (like stomach)

Question 9

Gizzard

Answer 9

grinding food

Question 10

Intestine

Answer 10

digesting and absorbing nutrients

Question 11

Anus

Answer 11

eliminate

Question 12

respiratory system

Answer 12

aquatic- has gills
nad(earthworms)- diffusion through moist skin
they also have secrete mucus to keep skin moist.

Question 13

Circulation

Answer 13

• closed circulatory system-blood flow is in vessels
• have hearts (aortic arches) 5 hearts on dorsal side.
• heart is a thickened blood vessel which can pump blood
• dorsal blood vessel-runs the length of worm (on back)
• ventral blood vessel- on stomach; length of worm.
• blood has hemoglobin to carry oxygen, similar to ur blood

Question 14

excretion

Answer 14

-solid waste- anus=digestive system
-liquid waste- nephridia
filter fluids & nitrogenous waste

Question 15

nervous system: response

Answer 15

• brain-dorsal ganglion
• ventral nerve cords(down length of stomach)
• small ganglia and nerves in each segments
• sensory receptors-anterior
• tentacles
• chemical receptor
• eyes… can sense light or dark
• statocysts.. detect gravity

Question 16

nervous system: movement

Answer 16

• longitudinal muscles stretch long, shorter or fatter
• circular muscles 00 contract to make thinner or thinker
• setae- on each segment; bristles anchor in soil, used for burrowing
• marine worms-paddles called parapodia for swimming

Question 17

asexual reproduction

Answer 17

None

• may have regeneration when end of worm is broken off
• it can regrow

Question 18

sexual reproduction

Answer 18

• most hermaphrodic (both sexes in the same )
• rarely fertilize their own eggs
• 2 worms exchange
• clitellum secretes a mucus “cocoon” eggs and sperm are released into it
• young worms hatch from “cocoon”

Question 19

septum

Answer 19

wall separating each segment

Question 20

longitudinal and circular

Answer 20

muscles allowing each segment to contract

Question 21

setae

Answer 21

bristles found on each segment

Question 22

what type of circulatory system do annelids have?

Answer 22

a closed system

Question 23

what class do earthworms belong to?

Answer 23

oligochaeta

Question 24

what class do marine worm belong to ?

Answer 24

polychaeta

Question 25

what class do leeches belong to?

Answer 25

hirudinea

Question 26

a thickened band of segments towards the anterior

Answer 26

clitellum

Question 27

internal walls between each segment in an earthworm

Answer 27

septa

Question 28

blood sucking organisms in this phylum

Answer 28

leeches