ENTOM 305- Animal Health Entomology (Lect. 5- Digestive, Excretory & Nervous System)

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Anonymous
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283430
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ENTOM 305- Animal Health Entomology (Lect. 5- Digestive, Excretory & Nervous System)
Updated:
2014-09-18 08:21:21
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Entomology
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Animal Health Entomology
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  1. Insects feed on either...
    • - solids or liquids
    • - plant carbohydrates or animal protein
  2. Insects feed on solids...
    • - herbivores (locusts, caterpillars) feed on plant carbohydrates
    • - carnivores (mantids, ground beetles) feed on animal protein
  3. Insects feed on liquid...
    • - sap feeders (aphids) feed on plant carbohydrates
    • - blood feeders (fleas, stable flies) feed on animal protein
    • - scavengers (cockroaches, mosquitos) feed on both plant carbohydrates and animal protein
  4. Insect digestive system consists of 3 major sections __________ plus __________
    • 1.) foregut
    • 2.) midgut
    • 3.) hindgut
    • Plus the salivary glands and their enzymes
  5. Insect Digestive System
  6. Foregut (stomodeum)
    • - extends from the mouth to the end of the proventriculus
    • - lined with a layer of cuticle (intima) which is shed with each molt
    • - cuticle serves as mechanical protection & prevents movement of certain molecules through the gut lining
  7. Insect salivary glands
    • - contains digestive enzymes
    • - some also secrete silk (caterpillars & Hymenoptera)
    • - some also secrete anticoagulants (blood feeders)
    • - some also secrete antimicrobial factors (blowfly larvae)
  8. Insect Midgut
    • - midgut extends from the stomodeal valve to the proctodeal valve (derived from endoderm & not lined by cuticle, absorbing lots of nutrients)
    • - the midgut (ventriculus) is the main site of digestion & absorption of food
    • - gastric caecum secrete proteinases & peptidases to break proteins into amino acids; amylases & carbohydrases to break down carbs; lipases to break down fats
    • - peritrophic membrane encloses the food but is permeable to enzymes & nutrients (it is secreted by epithelial cells & made of chitin in a protein-carbohydrate matrix
  9. Insect hidgut
    • - extends from pyloric valve to anus
    • - functions in resorption of H20, salts & amino acids & in some cases...
    •    - pheromone production (fruit flies)
    •    - respiration (dragonfly gills)
    •    - fermentation chamber (termintes)
    • - derived from ectoderm & lined with cuticle= little absorption
    • - consists of anterior hindgut (ileum & colon) & posterior hindgut (rectum)
  10. Excretory System
    -

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