GENERAL HISTOLOGY

Detailed explanation-1: -It reabsorbs approximately 80% H₂O, Na+, K+, HCO3-. ions, entire glucose and amino acids. Some amount of Vitamin C is also reabsorbed. It also helps in maintaining the pH and ionic balance of the body fluids by selective secretion of H+ ions.

Detailed explanation-2: -As the urine moves along the tubules of the nephrons, some useful substances like glucose, amino acids, salts, and water are selectively reabsorbed from it.

Detailed explanation-3: -Selective reabsorption is the process whereby certain molecules (e.g. ions, glucose and amino acids), after being filtered out of the capillaries along with nitrogenous waste products (i.e. urea) and water in the glomerulus, are reabsorbed from the filtrate as they pass through the nephron.

Detailed explanation-4: -Under normal circumstances, up to 180 g/day of glucose is filtered by the renal glomerulus and virtually all of it is subsequently reabsorbed in the proximal convoluted tubule. This reabsorption is effected by two sodium-dependent glucose cotransporter (SGLT) proteins.

Detailed explanation-5: -Glucose, amino acids, NaCl and other essential salts are reabsorbed in the second step of urine formation i.e Tubular Reabsorption. These essential substances are filtered from blood in the first step called glomerular filtration and are reabsorbed as they are vital for body function.