Respiratory pigments

Respiratory pigments

1. RESPIRATORY PIGMENTS NAVIN KUMAR amburose , I M.Sc. Zoology, CHIKKAIAH NAICKER COLLEGE, ERODE-638004, Tamil nadU , INDIA.

2. Definition Coloured protein molecule Present in blood Transporting oxygen & carbon- di -oxide

3. IMPORTANT RESPIRATORY PIGMENTS Haemoglobin Haemocyanin Haemoerythrin Chlorocruorin Pinnaglobin Vanadium Echinochrome Molpadin

4. HAEMOGLOBIN Red coloured Chromo protein Occurs in all vertebrates Occurs in the blood corpuscles of vertebrates Each haemoglobin molecule is made up of four haem groups surrounding a globin group. Globin is formed of four polypeptide chains Haemoglobin developing in the bone marrow When red cells die, haemoglobin is broken up: iron is salvaged

5. HAEMOCYANIN Blue coloured pigments (colourless) Consists of one copper atom & a peptide chain of about 200 amino acids It absorbs UV rays Transport of gases and in storage It occurs in blood plasma Hemocyanin are found only in the Mollusca and Arthropoda:

6. Haemoerythrin Reddish violet coloured pigment (colourless) Formed of iron and protein. Molecular weight 66,000 to 120,000 daltones . It occurs in the corpuscles of sipunculus and the plasma of other organism. It is less efficient in oxygen carrying capacity of other pigments.

7. chlorocruorin Green coloured pigments (dark & light) Discovered by milne Edwards in 1938( annelids) Its containing iron and ferric from. It occurs in the plasma. It functions only at high oxygen tensions.

8. pinnaglobin Brown colour pigment It occurs in the body fluid It is a manganese containing blood pigment

9. vanadium It is present in the blood cells of ascidians It also occurs in the plasma of several other organisms It is a green coloured

10. echinochrome Red coloured pigment Containing iron pigment It occurs is the coelomic fluid of sea urchin MOLPADIN It occurs in the black sea cucumber

11. Functions of respiratory pigments They are the oxygen carriers All the pigments have great affinity towards the respiratory gases Respiratory pigments show reversibility in their action Heamoglobin +oxygen oxyheamoglobin Respiratory pigments help to maintain colloid &osmotic pressure of blood.