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 is bioremediation, Question 1 Write a short note on the following ...

Question 1 Write a short note on the following Impactors Land fills Bio stimulation Green house effects Question 2 What is bioremediation? Give an account o

Describe the part of the female reproductive system, Q. What is the part of...

Q. What is the part of the female reproductive system where fecundation occurs? Fecundation in general occurs in the Fallopian tubes but it can also take place within the uteru

How can the abundance and diversity of living beings, How can the abundance...

How can the abundance and diversity of living beings in the tropical forests be explained? The biodiversity of these ecosystems can be described by the great availability of th

Inverse pcr, Inverse PCR is the variation of PCR which makes the amplifica...

Inverse PCR is the variation of PCR which makes the amplification of DNA segments of unknown sequence that flank DNA segments of the known sequence possible; in short, total DNA i

#title.examples of classes of vertebrates, how to explain an example from e...

how to explain an example from each class of vertebrate

Blood collection, Blood Collection: Blood for analysis may be obtained...

Blood Collection: Blood for analysis may be obtained from veins, arteries, or capillaries. Venous blood is usually the specimen of choice, and venipuncture is the method for

Define lipids - tests for presence of exoenzymatic activity, Define Lipids ...

Define Lipids - Tests for Presence of Exoenzymatic Activity? Lipids are also high molecular weight compounds. Enzyme lipases (esterases) cleaves the ester bond to form glycerol

Sedge-meadow stage - hydrarch, Sedge-Meadow Stage - Hydrarch Favoured ...

Sedge-Meadow Stage - Hydrarch Favoured by an increasing amount of light, as the former occupants disappear, they gradually change the reed swamp into a sedge meadow. And now s

Estrous cycle - reproduction, Normal 0 false false false ...

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

Pulses - hypertension, Pulses Careful examination of both upper and lo...

Pulses Careful examination of both upper and lower limb pulses is useful in detecting coarctation, and other arterial stenosis. The carotid arteries should be checked for sten

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