Question

Note on excretory system of cockroach

Answer 1

$\text{\underline{\underline{Excretory\:system\:of\:Cockroach:}}}$

It regulates the amount of nitrogenous material, inorganic salts and water in blood or haemolymph.


Excretory system includes the following:

$\implies$ Malpighian tubules

$\implies$ Fat body

$\implies$ Nephrocytes

$\implies$ Uricose glands


1. $\text{\underline{Malpighian\:tubules:}}$

$\bullet$ These are attached to the alimentary canal at the junction of midgut and hindgut.

$\bullet$ These are fine, long, unbranched, yellowish and blind tubules lying freely in the haemolymph.


2. $\text{\underline{Fat\:body:}}$

$\bullet$ It consists of fat cells which lie below the body wall filling most of the space within the body which is not occupied by other internal organs.

$\bullet$ These cells accumulate, produce and store uric acid and urate granules throughout life.


3. $\text{\underline{Nephrocytes:}}$

$\bullet$ These are large colourless ovoid binucleate cells attached to the dorsal diaphragm in the body cavity.

$\bullet$ They are also found arranged on each side of the heart.


4. $\text{\underline{Uricose\:gland:}}$

$\bullet$ In male cockroach of some species possess urecose glands on the periphery of mushroom glands.

$\bullet$ The glands synthesise uric acid.