The role of coelomic and vascular hemoglobin in the annelid family terebellidae
1. 1. Monomeric hemoglobins extracted from terebellid coelomic cells have high oxygen affinities (1-3 mm Hg) with no co-operativity or phosphate dependence in oxygen binding. Hill plots describing deoxygenation of hemoglobins within cells have similar P50's, but the curves are biphasic. 2. 2. The high molecular weight hemoglobins dissolved in blood have a relatively low oxygen affinity (10 mm Hg) with slight co-operativity and no sensitivity to phosphates and NaCl. In vivo they transport oxygen primarily to coelomic fluid rather than deep tissue. 3. 3. Terebellid hemoglobins are responsible for 30-55 per cent of total oxygen consumption at pO2's prevailing both at high tide, when oxygen transport is believed to be their major function, and at low tide when oxygen storage predominates. © 1975.
Mangum, CP; Woodin, BR; Bonaventura, C; Sullivan, B; Bonaventura, J
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