Page 24 - SAAT BIOLOGY PART 1

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET

• Movement is limited by the structure of the

endoskeletons and body types of the different classes of

echinoderm.

• With the tail free of digestive organs, the muscles along

each side can move the tail back and forth with powerful

motions

• Invertebrate chordates have notochords, not the

backbones (wertebrae) of the chordates.

• The water vascular system functions in locomotion,

excretion, circulation, and respiration.

• The only chordate feature that is present in both the adult

tunicate and adult lancelet is pharyngeal gill slits.

(Reproduction and digestion are not functions of the

water vascular system).

• Invertebrate Chordates

• Sea lilies and feather stars arms and tube feet wave

passively in the water currents, catching suspended

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM 23