K.C.S.E Biology Q & A - MODEL 2019PP1QN22

K.C.S.E Biology Q & A - MODEL 2019PP1QN22

The chart below illustrates how respiratory gases are transported in the human blood.

​(a) Identify gas Q. 
(b) Explain the advantage oxyhaemoglobin has over carboxyhaemoglobin.

answers

(a) carbon(ii) oxide acc. CO
(b) Oxyhaemoglobin is unstable/fully dissociate, releasing oxygen to the tissues/dissociate giving haemoglobin free to take up more gaseous molecules(hence constantly supplying the much needed oxygen to the respiratory tissues); carboxyhaemoglobin is stable/binds itself on the haemoglobin molecules /does not dissociate ,hence starving the tissues/cells of the oxygen ,leading to suffocation/death