Question

practice it
what is progesterone?
a hormone produced by the pituitary gland that stimulates milk production
a hormone produced by the thyroid gland that controls metabolism
a hormone produced by the adrenal glands that regulates blood pressure
a hormone produced by the corpus luteum that helps to maintain the thickened uterine lining and prepare it for potential implantation of a fertilized egg
a hormone produced by the pancreas that regulates blood sugar levels

Explanation:

Progesterone is a hormone. The corpus luteum (a structure in the ovary) produces progesterone. Its main role is in the female reproductive system. It helps maintain the thickened uterine lining (endometrium) which is important for the potential implantation of a fertilized egg.

• The pituitary - gland - produced hormone that stimulates milk production is prolactin, not progesterone.
• The thyroid - gland - produced hormones that control metabolism are thyroxine ($T_4$) and triiodothyronine ($T_3$).
• The adrenal - glands - produced hormones that regulate blood pressure include aldosterone (mineralocorticoid) and some glucocorticoids (indirectly affect blood pressure).
• The pancreas - produced hormones that regulate blood sugar levels are insulin (lowers blood sugar) and glucagon (raises blood sugar).

Answer:

A hormone produced by the corpus luteum that helps to maintain the thickened uterine lining and prepare it for potential implantation of a fertilized egg.