Biology 9700 · AS & A Level · Homeostasis in mammals

Homeostasis in mammals — practice question

(a)[3]

Fig. 6.1 shows a Bowman’s (renal) capsule from a nephron in a mammalian kidney. On Fig. 6.1, use label lines and letters to identify: E - the efferent arteriole G - the glomerulus P - the podocyte cell region.

(b)[5]

Describe how the epithelial cells of the proximal convoluted tubule are structurally adapted for selective reabsorption.

(c)[4]

Complete the sentences below about osmoregulation. In mammals, the water potential of the blood is continually tracked by ..................................................... in the hypothalamus of the brain. When the water potential of the blood falls, the amount of a hormone called ..................................................... made in the cells of the hypothalamus rises. This hormone enters the blood through the ..................................................... This leads the kidneys to conserve more water until the water potential of the blood returns to the set point. This is an example of a ..................................................... mechanism.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: E is the label for the vessel on the left

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