for smell (olfactory receptors) is found on the antennae. The receptor for taste (gustatory receptors) is found on the palps of maxilla and labium. Figure . Periplaneta americana : Circulatory system $QWHULRUDRUWD $ODU\PXVFOHV &KDPEHUV RIKHDUW Figure .
Periplaneta americana : Nervous system &HUHEUDO JDQJOLD $EGRPLQDO JDQJOLD 7KRUDFLFJDQJOLD 6XERHVRSKDJHDO JDQJOLD &LUFXPRHVRSKDJHDO FRQQHFWLYHV 9HQWUDOQHUYH FRUG /DVWDEGRPLQDO JDQJOLRQ A cockroach can hold its breath for minutes, and can even survive being submerged under water for half an hour. They hold their breath often to help regulate loss of water. XI Std Biology-Zoology Chapter- Excretory System The Malpighian tubules are the main excretory organs of cockroach which help in eliminating the nitrogenous wastes from the body in the form of uric acid. Cockroach excretes uric acid, so it is uricotelic .
In addition, fat body, nephrocytes, cuticle, and urecose glands are also excretory in function. The malpighian tubules are thin, long, filamentous, yellow coloured structures attached at the junction of midgut and hindgut. These are about - in number and are present in - bundles. Each tubule is lined by glandular and ciliated cells and the waste is excreted out through the hindgut.
The glandular cells of the malpighian tubules absorb water, salts, and nitrogenous Thermoreceptors are found on the first four tarsal segments on the legs. The receptor chordotonal is found on the anal cerci which respond to air or earth borne vibrations. The photoreceptors of the cockroach consists of a pair of compound eyes at the dorsal surface of the head. Each eye is formed of about simple eyes called the ommatidia (singular: ommatidium ), through which the cockroach can receive several images of an object.
This kind of vision is known as mosaic vision with more sensitivity but less resolution. Arthropod eyes are called compound eyes because they are made up of repeating units, the ommatidia, each of which functions as a separate visual receptor. What is the difference between compound eyes and simple eyes? Why is mosaic vision with less resolution seen in cockroaches?
wastes from the haemolymph and transfer them into