Question

Before the placenta functions, the corpus luteum is the primary source for synthesis of which of the following hormones?

1. cortisol and thyroxine
2. estrogen and progesterone
3. LH and FSH
4. T4 and T3

Answer 1

The corpus luteum is the main source for synthesis of estrogen and progesterone before the placenta becomes functional in maintaining the pregnancy.

Step-by-step explanation:

Before the placenta functions, the corpus luteum is the primary source for synthesis of estrogen and progesterone. These hormones are crucial for maintaining the pregnancy. The corpus luteum forms from the leftover follicular tissue after ovulation, stimulated by the hormone LH. Progesterone secreted by the corpus luteum contributes to the nourishment of the blastocyst before the placenta takes over and plays a role in suppressing FSH and LH secretion. Estrogen produced by the corpus luteum also helps in maintaining the pregnancy and promoting fetal viability.