STRUCTURE AND FUNCTIONS OF EXCRETORY SYSTEM
Different types and their functional mechanisms
The removal of waste products of metabolism, especially nitrogenous compounds
from the body of insects is known as excretion. The excretion process helps the insect to
maintain
salt water
balance and thereby
physiological homeostasis
. Following are the
excretory organs.
1.
Malpighian tubules
Thin, blind-ending tubules, originating near the junction of mid and hindgut,
predominantly involved in regulation of salt, water and nitrogenous waste excretion. This
structure was discovered by Marcello Malpighi.
2.
Nephrocytes
Cells that sieve the haemolmph for products that they metabolize (pericardial
cells).
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