Biology
The diagram given below shows a section of a human kidney. Study the diagram carefully and answer the questions that follow:
(i) Label the parts numbered 1 to 4.
(ii) Why does part '2' have a striped appearance?
(iii) What is the fluid that passes down part '4'? Name the main nitrogenous waste present in it.
(iv) Mention the structural and functional units of kidneys.
(v) Name the two major steps in the formation of the fluid mentioned in Q. 5(a) (iii).
Excretory System
ICSE
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Answer
(i) The parts numbered 1 to 4 are:
- 1 → Cortex
- 2 → Medulla
- 3 → Pelvis
- 4 → Ureter
(ii) The medulla contains Henle's loop and collecting ducts that give it a striped appearance.
(iii) Urine passes down the Ureter. The main nitrogenous waste present in it is Urea.
(iv) Nephrons (also called uriniferous tubules, renal tubules, kidney tubules)
(v) The two major steps are —
- Ultrafiltration
- Selective Reabsorption.
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