What Impact Does the Steep Portion of the Oxyhemoglobin Dissociation

What impact does the steep portion of the oxyhemoglobin dissociation curve have on oxygen delivery?

A) No oxygen can be released to tissues until PO₂s are above 60 mm Hg
B) PO₂s below 60 prevents the release of oxygen from hemoglobin to tissues
C) Oxygen binds irreversibly with hemoglobin until the P50 is reached
D) PO₂s below 60 enhance the release of oxygen from hemoglobin to the tissues

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