Which hormone is produced first by the corpus luteum and then by the placenta?
A) Human chorionic somatomammotropin
B) Progesterone
C) Estrogen
D) Human chorionic gonadotropin

Question

Quizplus · Accepted Answer

Human chorionic gonadotropin from the developing blastocyst causes the corpus luteum to continue to secrete estrogen and progesterone. Estrogen levels from the corpus luteum and later the placenta rise to 30 times normal during a pregnancy. Over the length of the pregnancy, this hormone causes the breasts to double in size, encourages the external genitalia and uterus to grow, causes the uterus to be more irritable (prone to contract), and causes the pubic symphysis to become more elastic. Progesterone is produced first by the corpus luteum and then by the placenta. Along with estrogen, this hormone suppresses FSH and LH secretion so no additional eggs are developed during the pregnancy. Progesterone suppresses uterine contractions, promotes a rich lining of the uterus for the developing blastocyst and embryo to feed upon, and promotes the development of mammary glands and ducts. The placenta produces human chorionic somatomammotropin (HCS), which regulates carbohydrate and protein metabolism so that glucose and amino acids are available in the blood for the developing fetus.

Which Hormone Is Produced First by the Corpus Luteum and Then