Digestive system in cockroach, Biology

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.
Posted Date: 10/1/2012 6:58:07 AM | Location : United States







Related Discussions:- Digestive system in cockroach, Assignment Help, Ask Question on Digestive system in cockroach, Get Answer, Expert's Help, Digestive system in cockroach Discussions

Write discussion on Digestive system in cockroach
Your posts are moderated
Related Questions
Define Resistant Starch From the physiological perspective? RS is defined as the sum of starch and products of starch degradation not absorbed in the small intestine of healthy

Explain the Consequences of Malnutrition? Malnutrition manifests itself in terms of illness and death in all age groups. Children, pregnant women, nursing mothers and elderly a

1. Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 20 minutes, how long does it take the culture to reach a density of 6.4 ? 107 cells per ml

State the term - Molybdenum   Molybdenum is intimately related to nitrogen metabolism of plants. It is part of the nitrate reductase system which helps to utilise nitrate for n

what is the advantage of being dark skinned?

How are a hypothesis, a prediction, and an experiment related? A prediction is a statement made in advance that declares the results that will be get from testing a hypothesis

What is meant by the law of use and disuse and by the law of the transmission of acquired characteristics? As per to the law of use and disuse the characteristics of a body var

Q. What is the difference between the concepts of genome and karyotype? Genome is the set of DNA molecules that characterizes each species or each living being. The concept the

Is crossing over important for the diversity of biological evolution? Sexual reproduction and recombination of linked genes (crossing over) are, with mutations, the main instru

give two examples of chemical reactions which are catalysed by enzymes in the course of brewing