Dr. bruce says "its beneficial features are the ability to map ongoing psychological activities of the brain without injecting radioactive substances into the patient's body. in addition, they are much more widely available procedures than what was used before." what is dr. bruce describing?

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )