NEETZoologyHuman Reproduction
A 28-year-old female undergoes a blood test on day 25 of her menstrual cycle. The results reveal high levels of progesterone and the presence of human chorionic gonadotropin (hCG) in her blood. Based on these findings, which of the following statements correctly describes the physiological status of her reproductive system?
Options
- AThe corpus luteum will rapidly degenerate, and menstruation will commence within the next 3 days.
- BThe Graafian follicle is secreting large amounts of estrogen to support the early stages of pregnancy.
- CThe corpus luteum is maintained and continues to secrete progesterone, preventing the shedding of the endometr
- DThe corpus luteum is maintained by high levels of luteinizing hormone (LH) released from the anterior pituitar
Correct answer
C. The corpus luteum is maintained and continues to secrete progesterone, preventing the shedding of the endometr
Step-by-step solution
The presence of human chorionic gonadotropin (hCG) in the blood indicates that fertilization and implantation have occurred (pregnancy). During early pregnancy, hCG (secreted by the developing placenta) rescues the corpus luteum from degeneration. The maintained corpus luteum continues to secrete large amounts of progesterone, which is essential for maintaining the endometrium and preventing menstruation. Option 1 is incorrect because the corpus luteum only degenerates in the absence of fertilization. Option 2 is i