Consider the following statements:
During Urine formation which of the following substances are selectively reabsorbed from the initial filtrate?
1. Glucose
2. Amino Acid
3. Salts
4. Water
How many of the statements given above are correct?
Options
A1,2,3 and 4
B3 and 4 only
C1,2 and 3 only
D4 only
Show AnswerHide Answer
Correct Answer
A1,2,3 and 4
Model Answer
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. The amount of water reabsorbed depends on the amount of excess water present in our body.
Reabsorption is the process in urine formation which takes place in the PCT of the nephron.
During this process the essential substances are taken back by the blood plasma from the tubule of the nephron.
Glucose, amino acids, salts and high amount of water are reabsorbed in the nephron during the second step of urine formation, i.e., the selective reabsorption. These essential substances were filtered out from the blood in the first step called glomerular filtration and are reabsorbed as they are vital for the functioning of our body.
Diagram of a nephron labelling Bowman's capsule, glomerulus, afferent and efferent arterioles, cortex, outer and inner medulla, with water, NaCl and urea movement arrows.
