Lab 6 - Annelids

Question 1

Ingests soil

Answer 1

Mouth

Question 2

Muscular region of digestive system specialized for pumping in soil

Answer 2

Pharynx

Question 3

Passageway between pharynx and crop

Answer 3

Esophagus

Question 4

Thin-walled chamber where food is temporarily stored

Answer 4

Crop

Question 5

Thick-walled, muscular chamber where soil is mechanically ground and usable organic materials are separated from indigestible materials

Answer 5

Gizzard

Question 6

Long tube occupying the majority of the body in which nutrients are absorbed into the bloodstream

Answer 6

Intestine

Question 7

Specialized, muscular branches of the dorsal blood vessel that regulate blood pressure in the body

Answer 7

Aortic arches (“hearts”)

Question 8

Longitudinal blood vessel that returns blood to the aortic arches

Answer 8

Dorsal Blood Vessel

Question 9

Longitudinal blood vessel that distributes blood posteriorly to the body

Answer 9

Ventral Blood Vessel

Question 10

Cream-colored, lobed organs fastened ventrally, but extending dorsally around each side of the esophagus, that store maturing sperm

Answer 10

Seminal vesicles

Question 11

Site of sperm production

Answer 11

Testes (male)

Question 12

Ventrally located organs that receive sperm during copulation and store sperm until needed to fertilize eggs in cocoon

Answer 12

Seminal receptacles

Question 13

Site of egg production

Answer 13

Ovaries

Question 14

Paired excretory organs found along the lateral margins of all but the most anterior and posterior segments; they release waste fluids out of the worm through small pores in the body wall

Answer 14

Nephridia

Question 15

Thin, fleshy partitions between segments

Answer 15

Septa

Question 16

Small, bilobed structure lying dorsal to the pharynx in segments 3 and 4; houses the majority of neural ganglia in the worm

Answer 16

Cerebral Ganglia

Question 17

Long, white “cord” located along the ventral surface of the body; contains large swellings of ganglia in each segment that handle the majority of coordination without intervention of the cerebral ganglia

Answer 17

Ventral nerve cord

Question 18

An inward fold in the intestinal wall

Answer 18

Typhlosole

Question 19

The setae projecting from side flaps

Answer 19

Parapodia

Question 20

Used during reproduction for transferring sperm between individuals and in secreting a cocoon that contains the fertilized eggs

Answer 20

Clitellum

Question 21

Releases sperm during copulation

Answer 21

Vas deferens