Please explain the impotant steps which involves in the formation of urine(5 marks) - Biology - Excretory Products and their Elimination

Question

Please explain the impotant steps which involves in the
formation of urine(5 marks)

Jahirul Mazumder · Accepted Answer

Filtration of blood by
kidneys

In the first step of urine formation kidneys
reabsorb the water, small molecules and ions which are required
from the blood These molecules are removed from the blood
(excluding large proteins and corpuscles) through diffusion or
osmosis and the filtrate then flows into Bowman’s capsule
This process is termed as glomerular filtration After filtration,
the filtrate passes from the glomerulus to the
nephron

Reabsorption

During the process of Reabsorption molecules
such as water, glucose, Na+ and other nutrients move
from the renal tubules back to the peritubular capillaries that
surrounds the renal tubules Reabsorption of glucose, amino acids,
NaCl, potassium ions, water and bicarbonate occurs in the proximal
convoluted tubule Reabsorption of water and NaCl occurs in loop of
Henle and collecting ducts whereas reabsorption of water, NaCl,
bicarbonate and hydrogen ions occurs in Distal convulated
tubule

Secretion

The concentrated urine moves back into the
renal tubules from where it is excreted Uric acid, drugs and
hydrogen ions are secreted into the urine by proximal convulated
tubule and potassium and hydrogen ions are secreted into urine by
the distal convulated tubule