Circulatory system in cockroach, Biology

CIRCULATORY SYSTEM IN COCKROACH

Type is open or lacunar. i.e. b.v. absent. Organs are dipped in haemolymph.

1.      HAEMOLYMPH -

Blood and lymph are mixed. In plasma corpusulses or haemocyte present.

Haemocytes are euqal to W.B.C. and are of 2 types -

(i) Proleucocyte - small nucleus, large in size, produce antibodies.

(ii) Phagocyte - Large nucleus, small in size, engulf harmful bacteria.

In haemolymph Na+ & Cl- present.

In it free amino acids present function as asmotic regulation. Trehalase sugar present.

2.      HAEMOCOEL -

True coelome, schizocoelic, filled with haemolymph.

Due to dorsal & ventral porous septa coelome is divided in to three compartments -

(i) Pericardial - heart                        

(ii) Perivisceral - gut                   (Largest)

(iii) Perineural - Nerve cord            (Smallest)

Coelome is too much degenerated present only in reproductive area & some glands.

By dorsal septa haemolymph flows from perivisceral to pericardial only not vice versa.

By ventral septa haemolymph flows from perineural sinus to perivisceral sinus and vice versa.

Note :- Haemocoel is obliterated. true coelome i.e. flattened dorso-ventrally.

3.      HEART -

  1. Tubular, situated on dorsal side, flow of blood posterior ® anterior, in complete length, made up of 13 chambers (3 thoracic + 10 abdominal).
  2. First chamber is largest one, open in perivisceral sinus of head sinus. Last chamber is closed at base.
  3. Between 2 chambers, on lateral side 1 pair fenestrae or ostia present controled by auricular valve, allow haemolymph to enter in to heart chamber not vice-versa. In anterior part of heart chamber ventricular valve present.
  4. On lateral side of heart 13 pairs allary muscles present which are V-shaped. Pointed end is attached to tergum & flat end to dorsal septa.

Note :- Heart is Neurogenic but in anopheles and some other insects it is myogenic.

4.      MECHANISM

  1. First of all allary muscles are relaxed, volume of pericardial sinus is increased & so pressure is decreased, so blood comes from perineural & perivisceral to pericardial sinus.
  2. Allary muscles are contracted, volume of pericardial sinus is decreased & pressur is increased, so blood enters into heart's chamber. This time auricular valves are open and ventricular valve are closed.
  3. Allary muscles are relaxed, volume of pericardial sinus is increased, at the same time blood moves from posterior to anterior in heart and comes in perivisceral sinus of head sinus & to perineural sinus of body. this time ventricular valves are open & auricular valves are closed.
  4. Perineural sinus supply blood to leg. Perivisceral sinus collect blood from leg.
  5. Peri visceral sinus supply & collect blood from wings. At the base of wings, legs and antennae pulsating ampullae present.
  6. Heart beat 49 / minute. Gape between 2 systole is diastasis.
Posted Date: 10/2/2012 3:27:32 AM | Location : United States







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

Write discussion on Circulatory system in cockroach
Your posts are moderated
Related Questions
Explain Classification of Protein based on amino acid content? Nutritionally, amino acids are classified on the basis of the body's ability to synthesize them - as essential (i

CONJUNCTI V A - Ectodermal in origin. Formed by epidermis. It is thin, transparent covers cornea. Made up of stratified epithelium. It has 2 parts - (i) Ocular conjunct

Which one of the following is an example of ex-situ conservation? 1. Wildlife sanctuary 2. Seed bank 3. Sacred groves 4. National park Seed bank

Ans) The plant cell wall has structural and protective functions. It plays significant role in the constraint of the cell size, preventing the cell to break when it absorbs much wa

Q. What is cross contamination? Cross contamination is the passage of micro-organisms from one person to another via any route direct or indirect.

Define Manganese Metabolism - Micro Minerals? Intestinal absorption of Mil occurs throughout the length of the small intestine although the exact mechanism of absorption is not

Surgical preparation of the bone - drill technique It is essential not to allow the bone to be heated above 47°C during preparation of the site as this will cause bone cell dea

charaacteristics

What is the mode of nutrition in fish,human,amoeba,scorpian & toad ?

Mice (Mus musculus) have 40 chromosomes per diploid cell (2n=40). How many double- stranded DNA molecules, and how many chromosomes are there in a mouse cell that is in the G2 stag