Question

Diagram shows the transport of respiratory gases in the human body.

a. i) Name the structures labelled P and Q. [2 marks]
P:____________ Q:____________
ii) State two important characteristics of Q that enables the process of gaseous exchange to occur effectively between Q and the blood capillaries. [2 marks] _______________________________ b) Explain how P accepts oxygen from Q and transfers it to the body cells. [2 marks ] ______________________________ c) If an individual inhalers a lot carbon monoxide, what is the effect on the transport of oxygen by P? Explain. [3 marks ] _____________________________​

Answer 1

ai) P= Red blood cell Q= Alveoli

ii)1. It gives the lungs a large surface area to volume ratio.

2. It is moist and thin.

b) P has a disc or biconcave shape which allows the O2 to bind to it with the help of a protein called haemoglobin for it to be transferred to various parts of the body.

c) Carbon monoxide will bind to the haemoglobin to form carboxyhaemoglobin causing oxygen disruption