What body system Protects inner organs from illness and
injury, regulates body temperature,
detects stimuli from surroundings

the answer to you question is   jet streams

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 : )