How much nervous system does an echinoderm have? Sea stars have
A)a complex of nerve ganglia in each ray.
B)a central nervous system including a brain.
C)a simple nerve ring and radial nerves leading to simple sensory cells scattered over the epidermis.
D)no genuine nerve cells are found in echinoderms;they operate completely by a hydraulic system.

Question

Quizplus · Accepted Answer

Echinoderms, including sea stars, have a simple nerve ring and radial nerves leading to sensory cells scattered over the epidermis. While they do not have a central nervous system or brain, they do possess a decentralized network of nerve ganglia that allow for sensing and responding to stimuli. Additionally, echinoderms operate largely through a hydraulic system, but this system is regulated by the nervous system.

How Much Nervous System Does an Echinoderm Have? Sea Stars