<prompt> Which of these is the function of Decidua basalis of the endometrium?Monthly proliferation in response to estrogenRegeneration of endometriumShedding during menstrual phaseSecretory changes in response to progesterone  <response>: The superficial two thirds of endometrium is known as decidua functionalis. This layer undergoes monthly proliferative changes in follicular phase in response to estrogen and secretory changes in secretory phase in response to progesterone. Lower one third of endometrium, known as decidua basalis, does not undergo significant monthly proliferation, but instead is the source of endometrial regeneration after each menses. 