Blood Transport of Respiratory Gases. O2 carrying capacity of blood plasma is very low - about 0.2 mL O2 / 100 mL of plasma.Respiratory pigments allow more O2 to be carried by the blood.. Hemoglobin Oxygen Dissociation Curve. Respiratory pigments reversibly bind O2.Pigment O2 binding sites become saturated at high PO2, but release O2 at low PO2. .
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1. Gases Diffuse Down Pressure Gradients Partial pressure gradients determine the direction of diffusion of O2 and CO2.
A gradient of PO2 must be maintained all the way from the lungs to the tissues.
Similarly, a gradient of PCO2 must be maintained from the tissues to the lung alveolar space.
2. Blood Transport of Respiratory Gases O2 carrying capacity of blood plasma is very low - about 0.2 mL O2 / 100 mL of plasma.
Respiratory pigments allow more O2 to be carried by the blood.
3. Hemoglobin Oxygen Dissociation Curve Respiratory pigments reversibly bind O2.
Pigment O2 binding sites become saturated at high PO2, but release O2 at low PO2.
5. Bohr Shift
8. Bohr Shift Facilitates Loading and Unloading