(a) They carry ***** from kidneys to cloaca. In males, it also conducts the sperms.
(b) They are the excretory organs of a cockroach. They collect the nitrogenous wastes from the haemolymph and send them into the intestine.
(c) The muscle layers help in locomotion. It has sensory/receptor cells. Mucus is secreted by certain cells of the body wall.
