Final answer:
Accelerations with fetal movement during labor are reassuring signs caused by the fetus exerting pressure on the uterine wall and stimulating contractions.
Step-by-step explanation:
Accelerations with fetal movement during labor are reassuring signs. They indicate that the fetus is responding well to the contractions and are a normal part of the labor process. These accelerations are caused by the fetus exerting pressure on the uterine wall, which stimulates the production of oxytocin and increases uterine contractions.