(a(i))[1]
Name the site of osmoreceptors.
(a(ii))[1]
State the stimulus detected by osmoreceptors.
(a(iii))[1]
Name the structure that releases ADH into the blood.
(b(i))[2]
Using Fig. 1.1, calculate the percentage fall in the rate of urine production between ADH concentrations of $1$ and $3$ arbitrary units. Show your working. Give your answer to one decimal place.
(b(ii))[3]
Explain the pattern shown in Fig. 1.1.