Describe the structure and functioning of nephrons with the help of diagram
Answers
Explanation:
Structure :-
1)Each kidney is made up of a large number of excretory units called nephrons .
2)The nephron has a cup shaped bag at its upper end which is called Bowman's capsule
3)The lower end of Bowman's capsule is tube shaped and it is called a tubule .
4)The Bowman's capsule and the tubule taken together make a nephron .
4)One end of tubule is connected to the Bowman's capsule and its other end is connected to a urine collecting duct of the kidney .
5)The Bowman's capsule contains a bundle of blood capillaries which is called glomerulus .
6)One end of the glomerulus is attached to renal artery which brings the dirty blood containing urea in it . The other end of glomerulus comes out of Bowman's capsule as a blood capillary , surrounds
the tubule of nephron and finally joins a renal vein .
Functions
1)Ultrafiltration
2)Selective secretion
3)Reabsorption of filtered useful substances
Answer:
Explanation:
Structure of a Nephrons:
Nephrons are the basic filtering units of kidneys.
Each kidney possesses large number of nephrons, approximately 1-1.5 million.
The main components of the nephron are glomerulus, Bowman’s capsule, and a long renal tubule.
Functioning of a Nephron:
The blood enters the kidney through the renal artery, which branches into many capillaries associated with glomerulus.
The water and solute are transferred to the nephron at Bowman’s capsule.
In the proximal tubule, some substances such as amino acids, glucose, and salts are selectively reabsorbed and unwanted molecules are added in the urine.
The filtrate then moves down into the loop of Henle, where more water is absorbed.
From here, the filtrate moves upwards into the distal tubule and finally to the collecting duct. Collecting duct collects urine from many nephrons.
The urine formed in each kidney enters a long tube called ureter. From ureter, it gets transported to the urinary bladder and then into the urethra.