What are the conditions under which O 2 diffuses from the blood plasma into red blood cells and attaches to haemoglobin? When partial pressure of oxygen dis- solved in plasma is A. 40 mmHg in the systemic capillaries. B. 100 mmHg in the alveolar capillaries. C. 40 mmHg in the alveolar capillaries. D. 100 mmHg in the systemic capillaries.
Option B. Movement of oxygen from the plasma into rbc happens withinside the alve- olar capillaries. The better number (100 mmHg) must be selected to ensure that a concentration gradient exists.
