Question

The main function of mammalian corpus luteum is to produce

• A. estrogen only
• B. progesterone
• C. human chorionic gonadotropin
• D. relaxin only.

Answer 1

The Correct Option is B

The question pertains to the function of the corpus luteum in mammals. The corpus luteum is a temporary endocrine structure in female ovaries involved in the production of hormones essential for the regulation of the menstrual cycle and early pregnancy.

Explanation

1. Corpus Luteum Formation: The corpus luteum forms from the follicle that has released an egg during the process of ovulation.
2. Hormone Secretion: The main hormone secreted by the corpus luteum is progesterone. This hormone plays a critical role in maintaining the uterine lining for a fertilized egg to implant and for establishing pregnancy.
3. Supporting Hormones: While the corpus luteum primarily secretes progesterone, in some cases, it can also produce smaller amounts of estrogen and other hormones. However, the significant function remains the secretion of progesterone.

Analysis of Options

• Estrogen only: The corpus luteum secretes estrogen but not as its primary function. Hence, this option is incorrect.
• Progesterone: This is the primary hormone produced by the corpus luteum. It is crucial for maintaining pregnancy in its early stages, making this the correct answer.
• Human Chorionic Gonadotropin (hCG): This hormone is not produced by the corpus luteum. Instead, hCG is produced by the placenta during pregnancy. This option is incorrect.
• Relaxin only: Relaxin might also be produced by the corpus luteum, but it's not its main function. Thus, this option is incorrect as well.

Conclusion

Considering the functions and hormone secretions of the corpus luteum, the most accurate answer to the question is progesterone.