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

Timber, introduction,types,uses and characteristics of a good timber?

introduction,types,uses and characteristics of a good timber?

Zoology, About phylum platy helmenthus

About phylum platy helmenthus

Classification and justification of hemichordata, Q. Classification and Jus...

Q. Classification and Justification of hemichordata? Kingdom Animalia Animals; multicellular organisms with cells that lack a cell wall, many capable of inovement or movement o

Why the peritoneal cavity differ from the normal state, How does the presen...

How does the presence of thick, cloudy, yellowish fluid in the peritoneal cavity differ from the normal state?

Describe about transposition with large ventricular septal, Describe about...

Describe about Transposition of great arteries with large ventricular septal defect ? Transposition of great arteries with large ventricular septal defect: Usually the intercir

D-glucose exists in all of the forms except, As a result of mutarotation, D...

As a result of mutarotation, D-glucose exists in all of the following forms EXCEPT: Select one: a. L-glucopyranose. b. alpha-anomer. c. free aldehyde (linear) d. bet

Biochemistry starch and dextrin test, Why there is difference in the colour...

Why there is difference in the colour obtained for the dextrin solution (ammonium sulphate and dextrin )when brought to iodine test Respetively by first half saturation test and t

How does the intensity of facilitated diffusion differ, How does the intens...

How does the intensity of facilitated diffusion vary in relation to the concentration of the moved substance? What is the limiting factor? Like simple diffusion facilitated dif

What is intrinsic rate of increase, In a population of e-coli, it turns int...

In a population of e-coli, it turns into 4 individuals in 1 day (assuming no deaths). What is it instantaneous per capita birth rate? Assume instantaneous death rate is 0.10. What

What is the mendel’s first law, the Mendel's first law? A Mendel's firs...

the Mendel's first law? A Mendel's first law postulates that a characteristic (trait) of an individual is always determined by two factors, one inherited from the mother and th

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