The hemoglobin tetramer is composed of two identical dimers, αβ1 and αβ2. The dimers, which are held together by polar bonds, are able to move with respect to each other to assume either a taut or a relaxed form of the hemoglobin tetramer. An experimenter is attempting to isolate hemoglobin in its taut form. Where in the body would one find the highest concentration of the taut form of hemoglobin?
(A) Alveolar capillaries
(B) Coronary arteries
© Femoral arteries
(D) Peripheral capillaries
(E) Pulmonary veins