Page 26 - SAAT BIOLOGY PART 1

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET

• Water enters the water vascular system through the

madreporite.

• Stone canal is a part of the system that conducts the

water once it is inside.

• Ampullaassist the movement of the water in the water

vascular system.

• Ring canal is a part of the system that conducts the water

once it is inside.

• The echinoderms are radially symmetrical as adults

but probably had bilaterally symmetrical ancestors.

• The flexibility allows the animal to bend as the muscles

contract, making side to side movements of the body

and tail.

• All echinoderms are bilaterally symmetrical as larvae.

Then they develop five-part radial symmetry as adults.

• Sea cucumbers exhibit reduced calcium carbonate

plates in their endoskeleton. Crinoids have well-

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM 25