Question

Although the urinary bladder can hold as much as ............. ml of urine the desire for urination is usually experienced when
it contains about ......... ml.

• A. 500, 150
• B. 250, 100
• C. 150, 50
• D. 350, 100

Answer 1

The correct option is A 500, 150

A completely full urinary bladder is capable of holding approximately 500-600 ml of fluid. The urge to urinate occurs when the bladder contains about 150-200 ml of urine. The urge to urinate is stimulated by expansion of of the bladder. As the bladder walls fill with urine and expand, stretch receptors are stimulated and the micturition reflex is triggered. The micturition reflex centre is located in the spinal cord.