Micturition

Question 1

Where is the urine formed by the nephrons carried to?

How long is it stored there?

Answer 1

Urinary bladder

Till a voluntary signal is given by the CNS

This signal is initiated by the stretching of the urinary bladder as it gets filled with urine. In response, the stretch receptors on the walls of the bladder send signals to the CNS. The CNS passes on motor messages to initiate the contraction of smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter causing the release of urine

Question 2

Who sends signals where for release of urine?

Answer 2

Stretch receptors on the walls of the urinary bladder send signals to the CNS.

Question 3

Which structures are contracted and relaxed for the release of urine?

Answer 3

Contraction of smooth muscles of the urinary bladder

Simultaneous relaxation of the urethral sphincter

Question 4

Process of release of urine

Mechanisms causing release

Answer 4

Micturition

Neural mechanisms causing it is called micturition reflex

Question 5

Colour of urine

Answer 5

Light yellow coloured watery fluid

Question 6

ph of urine

Answer 6

Slighly acidic

pH = 6.0

Question 7

Smell of urine

Answer 7

Characteristic odour

Question 8

Urea production

Answer 8

On an average, 25-30gm of urea is excreted per day

Question 9

How does analysis of urine help?

Examples

Answer 9

Clinical diagnosis of many metabolic disorders as well as malfunctioning of the kidney

Presence of glucose (glucosuria) and ketone bodies (ketonuria) in urine are indicative of diabetes mellitus