Approximately how much urine distention occurs in the bladder with the descent of the fetal part into the true pelvis?

The correct answer is 100 CC because, during pregnancy and labor, as the fetal head descends into the true pelvis, it typically exerts pressure on the bladder. This pressure can lead to the bladder being compressed and can cause bladder distention to around 100 CC of urine.

At this stage of labor, the descent of the fetal part decreases the bladder's capacity as the growing weight of the fetus impacts the surrounding structures. While some level of variability exists among individuals, the most commonly accepted value approximates 100 CC as a typical volume for bladder distention in this scenario. Understanding this normal physiological change is crucial for midwives as it influences assessments during labor and aids in managing maternal comfort and potential bladder-related complications.