Haemoglobin is one of the most important molecules in the animal
kingdom. Its function is to carry oxygen to tissues. In lower
invertebrates the blood pigment is present in the haemolymph and is
not bound in cells. Later in the course of phylo genesis
haemoglobin remains associated with cells which produce it and in
this form it reaches the peripheral circulation. In higher
organisms the haemoglobin production is thus determined by two main
factors: haemoglobin synthesis in erythroid cells and the formation
of these erythroid cells which depends on cell proliferation in
haematopoietic organs. Human haemoglobin is made up of two chains
which combine from four different polypeptide chains formed in
varying ratios in different periods of the life cycle. During the
life span of humans the following haemoglobins are formed:
embryonic haemoglobins Gower 1 and 2, foetal haemoglobin F and two
adult haemoglobins A and A . E-and IX-chains are part of the
embryonic haemoglobins Gower 1 (E4) and 2 Gower 2 (1X2E2). These
haemoglobins predominate in embryos during the second month of
pregnancy and at the end of the first trimester they are completely
re placed by foetal haemoglobin F ( Y2). Adult haemoglobin A
consists of two IX and two -chains and is the main component of red
cells in adults. A relatively small component of red cells
accounting for less than 2 % of the total haemo globin, is
haemoglobin A2 (1X0)."
General
Imprint: |
Springer
|
Country of origin: |
Netherlands |
Release date: |
October 2011 |
First published: |
1977 |
Authors: |
J. Neuwirt
• P. Ponka
|
Dimensions: |
235 x 155 x 11mm (L x W x T) |
Format: |
Paperback
|
Pages: |
197 |
Edition: |
Softcover reprint of the original 1st ed. 1977 |
ISBN-13: |
978-9401010924 |
Categories: |
Books >
Medicine >
Clinical & internal medicine >
Haematology
|
LSN: |
9401010927 |
Barcode: |
9789401010924 |
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