Question

In old age, there is decrease in amount of urine output and difficulty in micturitions. It is due to

• A. Increase in number of nephrons.
• B. Increase in glomerular filtration.
• C. Decrease in number of nephrons and glomerular filtration.
• D. Both A and B.

Answer 1

The correct option is C Decrease in number of nephrons and glomerular filtration.

There is a gradual shrinking of nephron volume slowly as aging occurs. Also, there is reduction in nephron size with nephron shrinkage. As a result, there is decrease in number of nephrons and glomerular filtration.
Thus, the correct answer is option (C), 'Decrease in number of nephrons and glomerular filtration'.