Annelids

Question 1

Annelids

Answer 1

• hydrostatic skeleton
• one way digestive system
• well developed brain
• external bristles: setae for movement
• Setae May be replaced by parapodia
• Have heart
• Reproduce sexually some are hermaphrodites

Question 2

Oligochaeta

Answer 2

Earthworms
Few setae
Over 100 segments
Distinct anterior(front) and posterior(backside) ends
Cephalization

Question 3

What are the two muscles used for movement?

Answer 3

Circular and posterior muscle for movement

Question 4

What is the structure for reproduction?

Answer 4

Clitellum carries eggs and sperms

Question 5

What does earthworms use to dig

Answer 5

Prostomium

Question 6

Where does the food go after the earthworm eats

Answer 6

Temporarily stored in the crop
Grounded in gizzard
Digest and absorbed in intestine

Question 7

How does the blood pass through the earthworm’s body

Answer 7

• Dorsal blood vessel carries blood to the cell

- ventral blood vessel returns blood anteriorly

Question 8

How do they breathe

Answer 8

Moist skin

Diffusion

Question 9

How do they take shit

Answer 9

Long tubules called nephridia filters waste from blood and excrete through pores

Question 10

What can they observe in nature?

Answer 10

Light, touch, moisture, chemicals, temp and vibrations

Question 11

Hirudinia

Answer 11

Leeches
No setae or parapodia
Have anterior and posterior suckers for attachment
Sucks blood from host
Secretes an anticoagulant to prevent blood from clotting
Fresh water

Question 12

Polychaeta

Answer 12

Sand worms and clam worms
Marine
Uses parapodia to move
Take in oxygen through parapodia 
Have developed head with antenna and specializes mouthpart