Question

Fill in the function of each of the sea star's organs in the table below. Anus Ampulla Cardiac Stomach Central Disk Digestive Glands Gonads Madreporite Pyloric Stomach Radial Canal Ring Canal Tube feet Part II Sea Star Dissection: Procedure Watch the sea star dissection videos online and use the images/tables below to take notes during the videos Label the internal parts of the sea star below. Pyloric Stomach Spine Gills Radial nerve Pyloric Pyloric Stomach NO Podium Pyloric Stomach Pyloric Stomach SE YOURS 72.

Answer 1

	Thre intestine opens on the aboral surface by a posterior most aperture of the alimentary canal called anus.It is situated eccentrically on the aboral side for excreation.
Ampulla	They use tube feet on their arms to help them move,and each tube foot contains what is called an ampulla.These ampulla move water into tube feet.
Cardiac stomac	The cardic stomac has a muscular, highly folded wall bulged out to form five lobes,one opposite each arm help in proper storage of food.
Central disc	It is the activity centre of the starfish and also containd mouth of starfish.
Digestive gland	To the pyloric stomach are attached ten,long brownish or greenish glandular appendages variously called pyloric caeca,digestive gland,branchial and hepatic caeca.
Gonads	Gonads are reproductive organ.the male gonads are testes and female gonads are ovaries.

Madreporite	It is a part of water vascular system.It surface bears a number of radiating,narrow,straight or wavy grooves or furros.furrow consist minute pores at bottom.
Pyloric Stomach	The pyloric stomach is much smaller,flat and pentagonal sac.It communicate with the intestine.
Radial canal	From its outer surface the ring canal gives off a radial water canal into each arm that runs throughout the length of the arm and terminate as the lumen of terminal tentacle.
Ring canal	The ring canal or water ring is located to the inner side of the peristomial ring of ossicle and provide movement of food.
Tube feet	The tube feet are soft,thin-walled ,thin-walled,tubular,retractile structure provided with terminal disc or sucker.The sucker function as suction cups.