Q. Consider the following statements: - During the breathing cycle in humans, the lungs always retain a residual volume of air ensuring there is sufficient time for the absorption of oxygen and the release of carbon dioxide.
- Carbon dioxide is less soluble in water than oxygen and therefore is not primarily transported in the dissolved form in blood.
Which of the above statements is / are correct?
Answer:
Only 1
Notes: Statement 1 is correct as the lungs maintain a residual volume to facilitate continuous gas exchange. Statement 2 is incorrect because carbon dioxide is in fact more soluble in water than oxygen, allowing a significant portion to be transported in the dissolved form in blood. Oxygen, by contrast, relies primarily on binding to haemoglobin for transport.