Final answer:
Progesterone performs all the functions mentioned: regulating amniotic fluid volume, surfactant synthesis, uterine contractility, immune response suppression, and functioning as a growth factor in the uterus.
Step-by-step explanation:
The function that performs the regulation of amniotic fluid volume and electrolyte concentrations, involvement in surfactant synthesis in the fetus, inhibition of uterine muscle contractility, suppression of the immune response, and functioning as an autocrine and paracrine growth factor in the uterus is the hormone progesterone. Progesterone is primarily produced by the placenta during pregnancy, and it plays a crucial role in maintaining the pregnancy and supporting fetal development.