Question

what will happen if the stretch receptors of the urinary bladder wall are totally removed?
A) Urine will not collect in the bladder.
B) Micturition will continue.
C) Urine will continue to collect in the bladder
D) There will be no micturition

Answer 1

Hint:Urine is formed by the nephrons and finally, through the ureters, it comes down to the urinary bladder where it gets accumulated. In the urinary bladder stretch, receptors are present which gives a signal to the brain to start micturition.

Complete answer:Urinary bladder is the hollow, muscular, distensible organ of the urogenital system and it is located inferior to the peritoneum. Its main function is to collect urine. The volume of the bladder varies from person to person, but on average, it can hold 400-1000 milliliters of urine.
Urine gets accumulated in the urinary bladder where stretch receptors are present. When it gets filled with urine then stretch receptors present in the wall of the urinary bladder send a signal to the central nervous system (CNS) and in return, it stimulates the contraction of smooth muscles of the bladder and relaxation of the urethral sphincter and this causes the discharge of urine.
This process is called micturition.
But, when stretch receptors are removed from the urinary bladder then also urine continue to form and they are transported by the ureter as usual but now they are not accumulated in the urinary bladder because stretch receptors used to create space for the urine, and hence bladder was able to hold urine for some hours but as now stretch receptors are not present urinary bladder will not hold urine and hence there is a continuous discharge of urine (that means continuous micturition).
So option (D) is correct, There will be no micturition.

Note:1) Walls of the bladder are composed of thick smooth muscle called Detrusor muscle and this muscle is lined by a transitional epithelium internally, which is called Urothelium in the bladder. This urothelium is known for its high elasticity.
2) On average a normal adult discharges 1 to 1.5 liters of urine per day and its pH is 6.0 and through this 25-30 grams of urea excreted.