Biology: Earthworm

Question 1

describe digestion tract

Answer 1

food enters mouth
passes through the esophagus and crop
stored in the crop
crushed in the gizzard

Question 2

gizzard

Answer 2

muscular sac which clenches

Question 3

open or closed circulatory system

Answer 3

closed

Question 4

descrive the intestine

Answer 4

infolded to increase surface areafor pick up of nutrients

Question 5

describe the earth worms heart

Answer 5

5 pairs of aortic arches

Question 6

why does the skin have ot be mosit with mucus

Answer 6

for gas exchange to occur

Question 7

nephridia

Answer 7

filter out excess water, mineral salts, and urea from blood and excrete
similar to kidneys

Question 8

describe the central nervous system

Answer 8

brain and nerve cord

Question 9

describe the nerves

Answer 9

peripheral nerves run from t hebrain and nerve cord

Question 10

setae

Answer 10

bristles on underside of most segments, give worm traction in the dirt

Question 11

what are the function of 2 sets of muscles

Answer 11

one set makes the worm stretch out, other makes short and fat