This section is Section 2 of 3.

Speed as well as accuracy is important in this section. Work quickly, or you might not finish the paper. There are no  penalties for incorrect responses, only marks for correct answers, so you should attempt all 27 questions. Each question is worth one mark.

You must complete the answers within the time limit. Calculators are NOT permitted.

Good Luck!

The diagram shows a kidney and its associated vessels from a healthy individual.

1. Which row correctly identifies the vessels along with the concentration of urea they contain?
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    Explanation

    The correct answer is D.

    The correct answer is D: 3 is the renal vein, as this is the filtered blood obtained from the kidneys. During filtration, urea is removed from the blood, and the renal vein carries blood towards the heart. Hence, it has the lowest concentration of urea. 5 is the ureter which contains the highest concentration of urea. This is as, the filtrate contains urea which is filtered by the kidney to be excreted by the body.

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