Embryologically,the echinoderm water vascular system originates as modification of the
A)pyloric cecae.
B)dermal branchiae.
C)coelom.
D)Tiedemann's bodies.
E)closed circulatory system.

Question

Quizplus · Accepted Answer

The water vascular system in echinoderms originates as a modification of the coelom. This system consists of a network of fluid-filled canals and tube feet that are used for locomotion, feeding, respiration, and sensory perception. The coelom in echinoderms is a well-developed body cavity that is lined with mesoderm and is filled with a watery fluid. By modifying this fluid-filled cavity, echinoderms were able to develop a unique hydraulic system that has no analog in other animal groups.

Embryologically,the Echinoderm Water Vascular System Originates as Modification of the