The figure shows a section of human ovary. Select the option which gives the correct identification of A and B with function/characteristic

Options

A. B – Corpus luteum – secretes progesterone
B. A – Tertiary follicle – forms Graafian follicle
C. B – Corpus luteum – secretes estrogen
D. A – Primary oocyte – it is the prophase - I of the meiotic division

Answer

A

Explanation

The zona granulosa and theca cells of Graafian follicle remaining in the ovary after ovulation and some surrounding capillaries and connective tissue evolve into the corpus luteum. The corpus luteum produces progesterone and in the event of fertilization provides the required progesterone and in the event of fertilization, provides the required progesterone until the placenta is formed. In the absence of fertilization the lifespan of the corpus luteum is 14 days. It then degenerates into a corpus albicans which is mainly a scar tissue.