(a) Give reasons for the following : (i) Alveoli in lungs are richly supplied with blood capillaries. (ii)…
(a) Give reasons for the following :
(i) Alveoli in lungs are richly supplied with blood capillaries.
(ii) Respiratory pigment in the blood takes up oxygen and not carbon dioxide.
(iii) During anaerobic respiration, a 3-carbon molecule is formed as an end product instead of CO2 in human beings.
Solution
(a)
(i) To facilitate efficient exchange of gases.
(ii) It has high affinity for oxygen.
(iii) Lack of oxygen does not oxidise glucose completely and forms a 3-Carbon molecule or lactic acid.