entomology excretion system of insect
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The document contain a slide presentation about excretion system in insect.TRANSCRIPT
AGR145 – ENTOMOLOGYGROUP MEMBERDANIEL ALBERTCARLUIS ANDAM
ARMANDZO MURPHY
Excretion
What is EXCRETION?
Process where the organism eliminates metabolic wastes and unwanted chemicals from its system.
Insect Body
FUNCTIONS OF THE EXCRETORY SYSTEM IN INSECTS
*Problems insects face in their environments* Losing water because of the size/volume ratio of being small.
1. Controlling the ionic balance of the body fluidsa. Freshwater insects tend to lose ions to the environment.b. Insects in salt water tend to gain ions2.
So, the excretion help insect to gain or remove ions in certain condition.
Cont. . .
In insects most excretory products are excreted into the gut lumen and eliminated along with faecal matter.
Eliminating excess water and other unwanted chemicals that may be ingested and enter the body fluids, such as plant poisons and excess salts.
Structure of Excretion organ in Insect
Malpighian TubulesNephrocytes- cells that sieve the heamolmph
for product that they metabolizeFat bodies- loose or compact aggregation of
cells.Oenocytes – the cell of haemocoel, epidemis
or fat body with many function. Rectum – the posterior part of hindgut.
*but the major organ of excretion is Malphian tubules
Malpighian tubules
Malpigian tubules are found in the postrerior
region of insect.
The Malpighian tubules are surrounded by
muscles.
Produce the primary urine while the hindgut
produces the secondary or final urine.
General mode of action
Pre-urine is formed in the tubules.Nitrogenous waste and electrolytes are transport though
the tubules wall.Urea and amino acid are though to diffuse though the
wall.Ions like sodium and potassium are transported by active
pump mechanisms.Water follow thereafter.Pre urine along with digested food, merge in hindgutAt this time, uric acid precipitates out.Sodium and potassium ion are actively absorbed by
rectum along with water via osmosis. Uric acid if left to mix with feces, and excreted.
Process
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