1. Insects
Digestion

2. Insect Mouth Parts Mouth parts specialized for food type eaten
Mosquitoes have a needle like tube to pierce skin
Flies have a sponge like lobe to soak up liquids
Butterflies have coiled tubes to suck nectar

3. Piercing and sucking mouthparts allow carnivorous insects to suck up blood

4. Chewing mouthparts

5. Feeding and Digestion herbivorous insects consume plants
their mouth parts are modified for cutting and chewing leaves
Labrum and labium function like upper & lower lips respectively holding food in position
Sharp edged mandibles tear off food
Maxillae help hold and cut food

6. The digestive system of insects can be divided into 3 parts
Foregut or stomodeum
Midgut or mesenteron
Hindgut or proctodeum

7. Grasshopper Digestive Tract
Food enters mouth, saliva from salivary glands moistens food & it passes to esophagus & into the crop and gizzard where sharp, chitinous plates shred the food. Food is stored here and released a small bit at time
Shredded food enters midgut, is soaked in enzymes secreted by the gastric caeca (pockets that branch in digestive tract which give a large surface area)
Digested food is absorbed through the midgut wall
Undigested matter moves to the hindgut and leaves through the anus. ( see next slide)

8. Grasshopper Excretion
Malphigian tubules are excretory organs that collect waste from the food & extra water and waste from haemolymph ( Blood)
Malphigian tubules are attached to digestive tract between midgut & hindgut.
In dry climates water is returned to hemolymph and concentrated waste leaves body through anus

9. adaptations chewing insects. Piercing insects
Mouthparts are modified to chew up vegetation
are Herbivores- plants
They have a symbiotic relationship with protozoa and bacteria in the hind gut to break down cellulose.
Piercing insects
Mouth parts modified to pierce and suck up liquid
are carnivores- blood
their saliva contains anticoagulant to keep blood flowing.
they have a large crop to store blood releasing it a bit at a time into the mid gut for digestion

10. Grasshopper Video