Biology 9700 · AS & A Level · Homeostasis in mammals

Homeostasis in mammals — practice question

Fig. 1.1 shows part of a Bowman’s capsule together with a glomerular capillary.
(a(i))[2]

Identify the structures labelled A and B.

(a(ii))[2]

Glomerular filtrate is formed in the Bowman’s capsule by ultrafiltration. State the conditions necessary for ultrafiltration.

(b)[3]

As the fresh glomerular filtrate moves through the proximal convoluted tubule, selective reabsorption occurs. The liquid left in the proximal convoluted tubule eventually becomes urine. Table 1.1 shows three components of blood plasma that enter the glomerulus in a healthy person. Complete Table 1.1 by writing: increased, if the component is present and has a higher concentration than in blood plasma; decreased, if the component is present and has a lower concentration than in blood plasma; same, if the component is present and has the same concentration as blood plasma; not present, if the component is absent. You may use each response once, more than once or not at all.

(c)[2]

Sweating during exercise can trigger a response in the posterior pituitary gland and in the kidney. State the response to sweating that occurs in the posterior pituitary gland and the response that occurs in the kidney.

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