If the Radial Nerve in an Arm Is Cut,the Podia

question 31

Multiple Choice

If the radial nerve in an arm is cut,the podia in that arm lose coordination;if the circumoral nerve ring is cut,podia in all arms are uncoordinated and movement ceases.This indicates that

• A)the hydraulic system is not involved in movement of tube feet.
• B)the radial nerve controls the nerve ring.
• C)part of the function of tube feet is hydraulic and part is controlled by the nerve stimulation.
• D)water pressure in the hydraulic system is directly controlled by the nervous system.
• E)the sea star is aware of the extent it is damaged and can change behaviors to compensate.