Question

Which of these factors does not affect hemoglobin's affinity for oxygen?

Group of answer choices

temperature

blood pH

RBC metabolic activity

electrolyte balance

the PO2 of blood

Each of the following factors affects the rate of external respiration except the

Group of answer choices

solubility of oxygen in plasma.

PCO2 of the blood.

PN2 of the alveoli.

PO2 of the alveoli.

thickness of the respiratory membrane.

For maximum loading of hemoglobin with oxygen at the lungs, the

Group of answer choices

PO2 should be about 70 mm Hg.

pH should be slightly acidic.

BPG levels in the red blood cells should be high.

PCO2 should be high.

PO2 should be as high as possible.

Answer 1

1. Electrolyte balance.

There are several important factors that affect the affinity of hemoglobin to oxygen as therefore affect the oxygen-hemoglobin dissociation curve among them electrolyte balance does not play any role in hemoglobin affinity for oxygen. These factors which affect this curve include the (1) pH (2) temperature (3) carbon dioxide (4) 2,3-BPG and (5) carbon monoxide

2. PN2 of alveoli

External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air

The nitrogen is an inert gas, during breathing, there is no change in nitrogen percentage in inhaled as compared to exhaled air.

3.E) PCO2 should be high

The Bohr effect describes hemoglobin’s lower affinity for oxygen secondary to increases in the partial pressure of carbon dioxide and decreases in blood pH. This lower affinity, in turn increases the unloading of oxygen into tissues to meet the oxygen demand of the tissue.