Explain transport of oxygen by red blood cells, Science

Explain Transport of Oxygen by Red Blood Cells

Oxygen combines with haemoglobin, i.e., the red pigment in red blood cells. It combines with oxygen in the lungs, transports it around the body and releases the oxygen to cells that need it to form oxyhaemoglobin. Haemoglobin, you may already know, is a protein made up of 4 subunits, each of which contains a heme moiety attached to a polypeptide chain. Heme, is a complex made up of a porphyrin and one atom of ferrous iron. Each of the 4 iron atoms can bind reversibly one oxygen molecule. The iron remains in the ferrous form and the resulting combination with oxygen is known as oxygenation. The entire process can be represented as:

Hb4 + O2 → Hb4O2

Hb4O2 + O2 → Hb4O4

Hb4O4-k O2 → Hb4O6

Hb4O6 + O2 → Hb4O8

Hb4 stands for haemoglobin and O2 stands for oxygen.

The tension of oxygen in the arterial blood is about 90 -100 mm Hg and oxygen tension in the tissues is less than 40 mm Hg. When the arterial blood passes through the tissues, it carries oxyhaemoglobin. As the oxygen tension in the tissues is much lower, oxygen tension in the arterial blood falls. The oxyhaemoglobin in the red blood cells is exposed to low tension of oxygen, it dissociates and oxygen leaves the blood stream and enters the tissue. The equilibrium of oxyhaemoglobin and nonbonded haemoglobin at various partial pressures can be best studied through a oxygen dissociation curve.

Posted Date: 5/15/2013 3:02:58 AM | Location : United States







Related Discussions:- Explain transport of oxygen by red blood cells, Assignment Help, Ask Question on Explain transport of oxygen by red blood cells, Get Answer, Expert's Help, Explain transport of oxygen by red blood cells Discussions

Write discussion on Explain transport of oxygen by red blood cells
Your posts are moderated
Related Questions
How is our atmosphere different from the atmospheres on Venus and Mars? Earth's atmosphere is different from those of Venus and Mars. This difference lies essentially in their c

Explain Protective and Excretory Function Protective function: Large quantity of mucin is secreted by gastric glands. Mucin lubricates the food bolus (a mass of chewed food) an

what are the kinds of animals?

three steps of age hardening

describe the factors which decide the broad area of scientific activity

Medicine: Aristocratic patronage for physicians and surgeons was not wanting, though, perhaps, surgeons did not enjoy a very high status in comparison  to physicians. The Greek

Neptune The eigth planet, Neptune, was discoveted  in  1846 by  astronomer Johann Gottfried Galle. We have already told you  the story of  its discovery  in last. It  is so f

Explain the Hyposecretion during Adult Life Hyposecretion during adult life: It is only currently becoming recognized, the usual feature being low blood glucose level (hypoglyc

what is atom

Importance of Parent materials Different rocks or parent materials placed under similar climatic conditions give rise to soils which are very similar to one another.  On the o