Final answer:
You don't feel the urge to pee unless your bladder contains approximately 150 to 200 milliliters of urine.
Step-by-step explanation:
The sensation of needing to urinate is triggered when the bladder reaches a certain volume, typically around 150 to 200 milliliters of urine. This threshold activates stretch receptors in the bladder wall, signaling to the brain that it's time to empty the bladder. As the bladder continues to fill, the stretch receptors send increasingly urgent signals, creating the sensation of urgency.
The specific volume at which the urge to urinate is felt can vary among individuals, but the range of 150 to 200 milliliters is a general approximation. This physiological mechanism helps regulate the timing of voiding and prevents unnecessary trips to the restroom when the bladder contains only small amounts of urine.
Understanding this threshold is important for maintaining normal bladder function and recognizing when it may be appropriate to empty the bladder to ensure comfort and prevent overdistension.