Question 18N.3.HL.TZ0.21

a. pH of blood is regulated to stay within a narrow range/7.35 to 7.45 ✔
If values provided, both required

b. increase in CO₂ produced during aerobic respiration «during exercise» ✔

c. CO₂ reacts with water to form carbonic acid ✔

d. chemoreceptors detect drop in blood pH «when CO₂ concentration rises»
OR
«increase in» CO₂ lowers blood pH ✔

e. carbonic acid dissociates to form hydrogen carbonate ions and hydrogen ions ✔
Allow formula

f. hydrogencarbonate is alkaline/increases pH/neutralizes H⁺ ions ✔
OWTTE

g. hydrogen ions bind to plasma proteins/hemoglobin ✔

h. stimulation of breathing centre/medulla oblongata
OR
ventilation rate increased ✔

i. faster diffusion/removal of CO₂ «in alveoli/lungs» ✔