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Oxygen hemoglobin transport

The porphyrins are called pigments of life and occur broadly in nature. They fulfill many roles ranging from oxygen transportation (hemoglobin), electron transfer (cytochromes), oxidations and reductions (peroxidase, catalase, cytochrome, oxi-... [Pg.314]

Description. Every cell in the body requires iron for a variety of functions. This versatile mineral is involved in oxygen transport (hemoglobin) and storage (myoglobin), is required by enzymes that produce energy for the cell, and it plays an important role in the function of the immune and central nervous systems. Iron is required in relatively high doses to maintain proper nutrition. Of aU the nutrients, the allowance for iron is the most difficult to obtain from dietary sources, aud therefore is the most common single micronutrient deficiency in the world. ... [Pg.266]

ERYTHROCYTES. Erythrocytes are biconcave diskshaped, blood cells (with pits or depressions in the center on both sides), the primary function of which is to transport hemoglobin, the oxygen-carrying protein. The biconcave shape of the erythrocyte provides a large surface volume ratio and thereby facilitates exchange of oxygen. The average diameter of erythrocytes is 7.5 pm, and thickness at the rim is 2.6 pm and in the center about 0.8 pm. The normal concentration of erythrocytes in blood is approximately 3.9-5.5 million cells per pL in women and 4.1-6 million cells per pL in men. The total life span of erythrocytes in blood is 120 days. [Pg.562]

Takeoka S, Sakai H, Kobayashi K, et al. Evaluation of oxygen transporting capability of hemoglobin vesicles. In Tsuchida E, ed. Blood Substitutes Present and Future Perspectives. Tokyo Elsevier Science S.A., 1998 171. [Pg.84]

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See also in sourсe #XX -- [ Pg.280 , Pg.282 ]



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