This document is written by a former IGCSE student . it is written in simple and easy statements not to mention the labelling on the kidney and nephron structure! also, the role of kidney in both homeostasis and excretion is explained briefly in quite a comprehensible way.
1)Bowman’s capsule:is the site where
ultrafiltration occurs. The high blood
pressure allows filtration. Small
soluble molecules are filtered out and
are forced out of capillary pores in Loop of henle
blood cells-RBCs,WBCs,Platelets-and
plasma proteins like fibrinogen bcz
they are large molecules to pass
through the membrane ) to be
collected in the Bowman’s capsule
2)First coiled tubule/proximal covulated tubule: is the place where
selective reabsorption occurs.Useful molecules like most of glucose is
reabsorbed by ACTIVE TRANSPORT (in which some glucose and O2 are
aerobically respired to release energy), amino acids and salts by
ACTIVE TRANSPORT, and remaining water by osmosis into the blood
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