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Short-term memory provides deduction of the limited part of the arrived information, allows to reproduce its any part and by that some времяиспользовать certain quantity of the information. As a part of a saliva some products of an exchange, such as urea, uric acid, medicinal substances (quinine, strychnine), and also the substances which have arrived in an organism (salts of mercury, lead, alcohol) can be allocated. Blood from it парциального pressure it is possible to present dependence of linkage of oxygen in the form of the schedule where on an axis of abscisses it is postponed рО2в blood, on ordinate - saturation of haemoglobin by oxygen. This schedule - a curve диссоциации оксигемоглобина, or сатурационная the curve, shows, what share of haemoglobin in the given blood is connected with О2при this or that it парциальном pressure and what - is dissociated, i.e. is free from oxygen. The curve диссоциации has the S-shaped form. The curve plateau is characteristic for sated О2 (сатурированной) arterial blood, and an abrupt descending part of a curve - venous, or десатурированной, blood in fabrics (fig. 21).