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INSECT EXCRETION.

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Presentation on theme: "INSECT EXCRETION."— Presentation transcript:

1 INSECT EXCRETION

2 Principal Organs of Excretion
Malpighian tubules nephrocytes rectal pads

3 Excretory Organs - Malpighian tubules

4 Excretory Organs - Malpighian tubules
distal honeycomb border Secretory region lumen brush border Absorbtive region proximal

5 Excretory Organs - Malpighian tubules
Honey- comb border Brush border

6 Excretory Organs - Nephrocytes

7 Excretory Organs - Rectal pads

8 Nitrogenous Products NH2 CO O C H N HN C NH3 Ammonia CO OC C N H N H CO Urea Uric Acid Toxicity

9 Removal of wastes

10 Removal of wastes Brush border Urea Honeycomb border
Precipitates as uric acid crystals or urate excrete H20 + base pH ≈ pH ≈ 6.5 Honeycomb border H20 to hemocoel H20 to hemocoel Uric acid crystals eliminated

11 Osmotic pressures (expressed as equivalent solution of NaCl (mEq/l))
Carausius Schistocerca Rhodnius Aedes (larva) Hemolymph 171 214 206 138 Tubule 226 228 130 Rectum 390 433 358 12 AQUATIC

12 Moved to gut as meconium
Removal of wastes Storage Excretion Stored as uric acid in fat body Moved to gut as meconium

13 Sources of water gain fog eating drinking


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