Question

Describe the mechanism of ultrafiltration in Bowman's capsule

Answer 1

Ultrafiltration is a process in the kidney by which urea, salt, water and glucose etc. is extracted from the blood. When blood passes through the top of the nephron, it enters a structure called the glomerulus which is a network of tiny capillaries. This causes the pressure to increase and fluid is forced through the "sieve-like" walls of the vessels into the Bowman's capsule. This fluid is called the filtrate. Blood cells and larger proteins do not pass through the capillaries as they are too large and so are not found in the filtrate. A large proportion what enters the filtrate is valuable to the body and so needs to be reabsorbed into the blood. This is a process called selective reabsorption.

Answer 2

Dear Student,

● Ultrafiltration -

• Filtration of specific substances from blood to form plasma-like filtrate in kidney is called ultrafiltration.
• It takes place in glomerulus (network of small capillaries in Bowmans capsule).
• Blood comes to afferent arterioles (wider) from renal artery and passes to efferent arterioles (narrower).
• Filtration pressure (mainly hydrostatic pressure) is responsible for pushing out solutes from blood.
• Water, salt, urea, glucose are removed by ultrafiltration.

Thanks dear. Hope this helps you...