Biology 9700 · AS & A Level · Homeostasis in mammals
Homeostasis in mammals — practice question
In mammals, the kidney is an organ that helps maintain homeostasis.
(a)[1]
Explain what the term homeostasis means.
(b)
Fig. 1.1 presents a section through a kidney.
(b(i))[2]
Using Fig. 1.1 as a guide, name structures A and B.
(b(ii))[3]
On Fig. 1.1, use label lines and letters to show where: U - ultrafiltration occurs; L - the loop of Henle is found; C - blood urea concentration is low.
(c)[5]
Describe the roles played by the hypothalamus and the posterior pituitary in osmoregulation.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “maintain / keep / restore an internal environment that is constant / stable within narrow limits” …