1.

Give reason why: -(i) Blood flows through the Glomerulus under great pressure.(ii) ln a nephron the blood flowing through efferent arteriole is thicker than the blood in the afferent arteriole .

Answer»

(i) Blood flows through great pressure in glomerulus because the afferent arteriole, which delivers blood to the glomerulus, has little vascular resistance because it is short and wide. And the pressure in capillaries of glomeruli is so high because it is specialized for filtration.

(ii) The afferent arteriole is of larger diameter than the efferent. This means there is high resistance as the blood is forced from a wider vessel to a narrower one and this promotes filtration.



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