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The causes of shift to right can be remembered using the mnemonic, "CADET, face Right!" for CO 2, Acid, 2,3-DPG, [Note 1] Exercise and Temperature. [2] Factors that move the oxygen dissociation curve to the right are those physiological states where tissues need more oxygen.
Hemoglobin's oxygen binding affinity (see oxygen–haemoglobin dissociation curve) is inversely related both to acidity and to the concentration of carbon dioxide. [1] That is, the Bohr effect refers to the shift in the oxygen dissociation curve caused by changes in the concentration of carbon dioxide or the pH of the environment.
In the oxygen-rich capillaries of the lung, this property causes the displacement of carbon dioxide to plasma as low-oxygen blood enters the alveolus and is vital for alveolar gas exchange. The general equation for the Haldane Effect is: H + + HbO 2 ⇌ H + Hb + O 2; However, this equation is confusing as it reflects primarily the Bohr effect.
The Bohr effect favors the T state rather than the R state. (shifts the O 2-saturation curve to the right). Conversely, when the carbon dioxide levels in the blood decrease (i.e., in the lung capillaries), carbon dioxide and protons are released from hemoglobin, increasing the oxygen affinity of the protein.
In addition, Bohr noticed that increasing CO 2 pressure shifted this curve to the right - i.e. higher concentrations of CO 2 make it more difficult for hemoglobin to bind oxygen. [2] This latter phenomenon, together with the observation that hemoglobin's affinity for oxygen increases with increasing pH, is known as the Bohr effect.
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