Gce Model Questions Vol1 2018 Biology Question 6

Practice essay / theory question 6 from the 2018 Gce Model Questions Vol1 Biology examination. This question covers Excretion .

Gce Model Questions Vol1 2018 Biology Essay / Theory

Topic: Excretion

Question 6 GCE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

The human kidney is the principal organ for excretion of metabolic waste and regulation of body fluid composition.

Question Parts

( a )

Describe the structural organization of a nephron and state the main function of each segment (glomerulus, proximal tubule, loop of Henle, distal tubule, and collecting duct) in the formation of urine.

( b )

A person consumes 120 g of protein in a day. Protein contains 16 % nitrogen by weight and 80 % of the absorbed nitrogen is converted to urea for excretion. The molecular weight of urea is 60 g mol⁻¹ and each mole of urea contains two nitrogen atoms (28 g N mol⁻¹). Estimate the mass of urea that must be eliminated in the urine (in grams). Show all steps of your calculation.

( c )

Explain how antidiuretic hormone (ADH) influences water re‑absorption in the collecting duct and the resulting effect on urine concentration.

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About This Question

This is Gce Model Questions Vol1 2018 Biology Question 6. It is one of the essay questions from the 2018 Gce Model Questions Vol1 Biology examination.

The question covers Excretion .

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