Write the function of osmoregulatory functional region of the nephron?
Answers
Answer:-
Nephron is the structural as well as the functional unit of kidney. It includes a network of capillaries, called the Glomerulus which performs the filtering mechanism, mainly to filter-out the useful substances required by our body. To understand the whole mechanism, one must be thorough with the structure of a nephron.
The whole mechanism is segregated into 3 main processes:
Ultrafiltration: During the process, the useful substances like water, glucose, amino acids, NaCl and urea get filtered through glomerular membrane. The efferent arteriole has a smaller diameter than the afferent arteriole. Because of this, a high hydrostatic pressure is developed inside the glomerulus which leads to the filtration of the above mentioned substances. The resulting filtrate is called glomerular filtrate.
Selective Reabsorption: Soon after the ultrafiltration, some useful substances are reabsorbed through the PCT. The structure of PCT is such that it increases the surface area for absorption of the filtrate. Glucose, A.A, and salts are reabsorbed against the concentration gradient. Hence, it gets energy through ATP via active transport.
Tubular secretion: This is the final stage of the whole process which is contrary to the process of selective reabsorption. It adds substances to the tubular fluid for their removal altogether. The secreted substance includes K+, H+, NH4+, creatinine, urea, some hormones, and some drugs (penicillin). These substances are entirely termed as urine.
And finally, the urine formed is collected in the collecting duct which further moves into the renal pelvis and ureter and finally out of the body through urethra.