Digestive system in cockroach, Biology

Assignment Help:

DIGESTIVE SYSTEM IN COCKROACH

ALIMENTARY CANAL

6-8 cm. long. Coiled, present from mouth to anus.

Differentiated into 3 parts -      1. Foregut            2. Midgut        3. Hindgut

1982_digestive system of cockroach.png

1.      FOREGUT

  1. Differentiated into pharynx, oesophagus, crop and gizzard.
  2. Pharynx is small tube like, present in neck.
  3. Pharynx is attached to oesophagus in thorax.
  4. Oesophagus forms crop (a sac like) upto 4th segment of abdomen.
  5. In crop food is stored & complete digestion takes place.
  6. At the base of crop gizzard or proventriculus present. Helpfull in grinding of food.
  7. Anterior part of gizzard is armarium, in it 6 denticles present made up of cuticle.
  8. Posterior part of gizzard is stomodeum in which 1 pair hairy pad pulvillus & 1 pair stomodeal valve present, allow only finnest particles of food.

2.      MID GUT

  1. Walls are soft and glandular. Starting point of mid gut is cardia.Digestion and absorption takes place in it.
  2. At the junction of mid gut and foregut 8 Hepatic ceacae present, secrete digestive juice that do digestion in crop.
  3. Secretion of stomodeal valve (Cardia) in mid gut forms peritrophic membrane around food to protect wall of mid gut.

3.      HIND GUT

  1. Differentiated into Iluem, colon & rectum.
  2. In ileum 6 spicules present function as sphinctor & tear off the peritrophic membrane.
  3. In colon undigested food is converted into faeces.
  4. In rectum on external surface 6 rectal ridges present alternate with 6 rectal pads on inner side.
  5. Maximum water is reabsorbed. Rectum opens outside by anus in 10th segment.
  6. Anus is controlled by 4 podical plates.

Related Discussions:- Digestive system in cockroach

What are the two groups of defense mechanisms of the body, What are the two...

What are the two groups of defense mechanisms of the body against foreign or harmful agents? What is the difference between them? The body has many defense mechanisms against f

Define can we improve the nutritive value of protein, Define Can we improve...

Define Can we improve the nutritive value of protein? Yes, as discussed above, the nutritive value of a protein can be improved in two ways: (1) by mutual supplementation, that

What do you mean by blinking and peering in the eyelid, What do you mean by...

What do you mean by blinking and peering in the eyelid? Blinking and Peering: Blinking considers as to the opening and closing movements of the eyelid. The function of b

Osmosis, Consider 100 ml of 10% solute and 10 ml of 50& solute. Which has t...

Consider 100 ml of 10% solute and 10 ml of 50& solute. Which has the greatest concentration of solute? What is the concentration of solute? Which has a greater quantity of solute?

Kangroo rat, Kangroo Rat Kangroo rat Dipodornys merriami, a native of ...

Kangroo Rat Kangroo rat Dipodornys merriami, a native of South-West America is a classical example of how small mammals survive in desert. It exhibits all the osmoregulatoryad

What factor contributed to the current variations, According to the theory ...

According to the theory of natural selection, what factor below contributed to the current variations in beak sizes of finch species on the Galapagos Islands? a. Finches dispersed

First type of rheological model, Q. First type of rheological model? Th...

Q. First type of rheological model? This method establishes relation between the pressure gradient and the volume rate of flow. Here, the piston measurement is used to measure

Digestive system - liver, LIVE R (HEPAR) - Largest gland of body. W...

LIVE R (HEPAR) - Largest gland of body. Weighing 1.6 kg. Form 1/40 of the body weight. Bio-chemical laboratory. Bussiest part in whole river of life. Dark reddish brown

What are dioxins and why they harmful for food safety, Normal 0 ...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Mollusca, what is phylum mollusca?

what is phylum mollusca?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd