Lab 6 - Annelids Flashcards
Ingests soil
Mouth
Muscular region of digestive system specialized for pumping in soil
Pharynx
Passageway between pharynx and crop
Esophagus
Thin-walled chamber where food is temporarily stored
Crop
Thick-walled, muscular chamber where soil is mechanically ground and usable organic materials are separated from indigestible materials
Gizzard
Long tube occupying the majority of the body in which nutrients are absorbed into the bloodstream
Intestine
Specialized, muscular branches of the dorsal blood vessel that regulate blood pressure in the body
Aortic arches (“hearts”)
Longitudinal blood vessel that returns blood to the aortic arches
Dorsal Blood Vessel
Longitudinal blood vessel that distributes blood posteriorly to the body
Ventral Blood Vessel
Cream-colored, lobed organs fastened ventrally, but extending dorsally around each side of the esophagus, that store maturing sperm
Seminal vesicles
Site of sperm production
Testes (male)
Ventrally located organs that receive sperm during copulation and store sperm until needed to fertilize eggs in cocoon
Seminal receptacles
Site of egg production
Ovaries
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
Nephridia
Thin, fleshy partitions between segments
Septa
Small, bilobed structure lying dorsal to the pharynx in segments 3 and 4; houses the majority of neural ganglia in the worm
Cerebral Ganglia
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
Ventral nerve cord
An inward fold in the intestinal wall
Typhlosole
The setae projecting from side flaps
Parapodia
Used during reproduction for transferring sperm between individuals and in secreting a cocoon that contains the fertilized eggs
Clitellum
Releases sperm during copulation
Vas deferens
