Question

The following is an oxygen dissociation curve. The characters depicted on the axes are

• A. X axis: partial pressure gradient of oxygen in mm Hg and
  
  Y axis: saturation of haemoglobin with oxygen
• B. X axis: saturation of haemoglobin with oxygen and
  
  Y axis: partial pressure gradient of oxygen in mm Hg
• C. X axis: percentage saturation of haemoglobin with oxygen and
  
  Y axis: partial pressure of oxygen in mm Hg
• D. X axis: partial pressure of oxygen in mm Hg
  
  Y axis: percentage saturation of haemoglobin with oxygen

Answer 1

Answer: (D)

Oxygen dissociation curve is a sigmoid shaped curve. This graph has a partial pressure of oxygen on X-axis and percentage saturation of hemoglobin on the Y-axis. This explains oxygen transport through blood. Right, and left deviations are seen in case of oxygen dissociation near tissues and its association near alveoli with hemoglobin respectively.