Adjacent cells can signal others by direct contact, while nearby cells that are not touching can communicate by the release of signals. a. paracrineb. autocrinec. peptided. endocrine

Adjacent cells can signal others by direct contact, while nearby cells that are not touching can communicate by the release paracrine signals.

Hope this helps,

Davinia.

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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