Biology 9700 · AS & A Level · Homeostasis in mammals

Homeostasis in mammals — practice question

Section B. Answer only one question.

(a)[9]

Describe how selective reabsorption occurs and explain how the cells of the proximal convoluted tubule are adapted to perform selective reabsorption.

(b)[6]

Describe the roles of the hypothalamus and the posterior pituitary in osmoregulation.

Worked solution & mark scheme

This 15-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Brush border / microvilli at the apical surface” …