Final answer:
Amniotic fluid pressure and fetal positioning are key in facilitating fetal descent during vaginal birth.
Explanation:
Pressure exerted by the amniotic fluid facilitates fetal descent during vaginal birth. The amniotic fluid helps cushion the fetus and aids in the movement through the birth canal.
Flexion and curling of the body of the fetus also play a crucial role in the descent during vaginal birth. The position and movements of the fetus affect the ease of delivery.
Secondary powers used during the first stage of labor assist in cervical dilation and effacement, preparing for the baby's descent.
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