Which of the following is a characteristic of the storage phase?

During the storage phase of micturition, the primary focus is on retaining urine within the bladder without involuntary contractions. Detrusor relaxation is a hallmark characteristic of this phase, allowing the bladder to fill comfortably without pressure or discomfort.

As the bladder fills, the detrusor muscle, which is the smooth muscle layer of the bladder wall, remains relaxed to accommodate the increasing volume of urine. This relaxation prevents the bladder from contracting, thus ensuring that no involuntary urination occurs during the storage phase.

In contrast, the other options do not align with the characteristic features of the storage phase. High detrusor pressure would be indicative of involuntary contractions during this phase, the presence of low urethral sphincter tone would complicate the situation by increasing the risk of leakage, and increased urination frequency is associated with conditions that influence bladder capacity and control rather than a characteristic of the storage phase itself.