Biology
The figure given below shows a part of a nephron.
Answer the questions that follow:
(i) In which region of the kidney is the above structure present?
(ii) Label the parts numbered 1 to 4.
(iii) What is the technical term for the process that occurs in part 3?
(iv) Why is fluid X not called urine? Justify your answer.
(v) Draw a neat, labelled diagram of the urinary system of man.
Excretory System
ICSE 2020
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Answer
(i) Cortex
(ii) Parts numbered 1 to 4 are:
- 1 → Afferent arteriole
- 2 → Efferent arteriole
- 3 → Glomerulus
- 4 → Bowman's capsule
(iii) Ultrafiltration
(iv) Fluid X is called glomerular filtrate and not urine because it contains almost all the liquid part of the blood i.e., plasma along with most of its organic and inorganic substances including urea, glucose, amino acids, etc. These substances, along with water, are reabsorbed before urine is formed.
(v) Labelled diagram of the urinary system is shown below:
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