Counter Current Mechanism

Assertion :- Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed. Reason :- Counter current mechanism helps to maintain a concentration gradient in the medullary interstitium.

Assertion :- Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed. Reason :- Counter current mechanism helps to maintain a concentration gradient in the medullary interstitium.

The increase in osmolarity from outer to inner medullary interstitium is maintained due to : (i) Close proximity between Henle's loop and vasa recta (ii) Counter current mechanism (iii) Selective secretion of HCO 3¯ and hydrogen ions in PCT (iv) Higher blood pressure in glomerular capillaries

The increase in osmolarity from outer to inner medullary interstitium is maintained due to : (i) Close proximity between Henle's loop and vasa recta (ii) Counter current mechanism (iii) Selective secretion of HCO 3¯ and hydrogen ions in PCT (iv) Higher blood pressure in glomerular capillaries

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),(A." PCT",(i)." Minimum reabsorption"),(B." DCT",(ii)." Filtration of blood"),(C." Loop of Henle",(iii)." Reabsorption of 70-80% electrolytes"),(D." Counter current mechanism",(iv)." Ionic balance"),(E." Renal corpuscle",(v)." Maintenance of concentration gradient in medulla"):}

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),(A." PCT",(i)." Minimum reabsorption"),(B." DCT",(ii)." Filtration of blood"),(C." Loop of Henle",(iii)." Reabsorption of 70-80% electrolytes"),(D." Counter current mechanism",(iv)." Ionic balance"),(E." Renal corpuscle",(v)." Maintenance of concentration gradient in medulla"):}

Assertion : Normal urine of man is hypertonic than the blood plasma. Reason : Counter-current mechanism of loop of Henle and Renin enzyme of juxta-glomerular cells increase the Na^(+) concentration in the adrenal medulla.

Assertion: In terrestrial animals,counter current mechanism helps in the concentration of the filtrate to pass out concentrated urine. Reason: Descending limb is impermeable to water while ascending limb is impermeable to Na^(+)