Neco 2024 Biology Question 6

Practice essay / theory question 6 from the 2024 Neco Biology examination. This question covers excretion .

Neco 2024 Biology Essay / Theory

Topic: excretion

Question 6 NECO • 2024 • BIOLOGY • essay

The diagram shows the human excretory system with the parts labelled: left kidney, right kidney, left ureter, right ureter, urinary bladder, urethra, renal artery and renal vein.

Question Parts

( a )

Describe the complete pathway of urine formation from the filtration of blood to its excretion, naming the major processes and structures involved.

( b )

Each kidney contains about 1,000,000 nephrons. If each nephron filters approximately 120 \mu L of plasma per minute, calculate: (i) the total volume of filtrate produced by both kidneys in one hour (express your answer in millilitres), (ii) the total volume of filtrate produced in one day (express in litres), (iii) assuming 99% of the filtrate is re‑absorbed, the net volume of urine excreted in a day (in litres).

( c )

A patient suffers a partial obstruction in the right ureter that reduces urine flow through that ureter by 30% compared with the normal unilateral flow of 0.5 L per hour. (i) Calculate the reduced flow rate through the obstructed ureter (in L per hour). (ii) Discuss two possible physiological consequences of a prolonged reduction in urine flow through a ureter.

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About This Question

This is Neco 2024 Biology Question 6. It is one of the essay questions from the 2024 Neco Biology examination.

The question covers excretion .

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