Where does the oxygen produced in respiration come from

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.

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bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.