Question:
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy ?
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy ?
Updated On: May 3, 2026
- Graafian follicle
- Corpus luteum
- Foetus
- Uterus
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The Correct Option is B
Solution and Explanation
The question asks about which structure secretes the hormone relaxin during the later phase of pregnancy. Let's understand each option before concluding.
- Graafian follicle: The Graafian follicle is a mature ovarian follicle that releases an egg during ovulation. It primarily secretes estrogen and does not play a significant role in producing relaxin.
- Corpus luteum: After ovulation, the Graafian follicle transforms into the corpus luteum, which secretes hormones such as progesterone and relaxin. Relaxin, produced by the corpus luteum, helps in softening the cervix and relaxing the pelvic ligaments in preparation for childbirth during the later phase of pregnancy.
- Foetus: The fetus does not secrete relaxin. It primarily relies on the mother's hormonal system for necessary adaptations during pregnancy.
- Uterus: The uterus is the site of fetal development, and while it undergoes changes under the influence of various hormones, it does not secrete relaxin.
By analyzing each option, we conclude that the Corpus luteum is responsible for secreting the hormone relaxin during the later phase of pregnancy.
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Concepts Used:
Pregnancy
The human gestation period or pregnancy lasts for over nine months or 266 days. At times, childbirth also takes place prematurely or even after nine (9) months. The entire process of pregnancy is split into trimesters of three intervals:
- First Trimester: This comprises the period mainly from week one to twelve. This is the embryonic or pre-embryonic development stage.
- Second Trimester: This comprises the period from week thirteen to the twenty-fourth. This is the stage of fetal development and normally, most the body parts develop in this stage.
- Third Trimester: This comprises the period from week twenty-fifth to that of the birth of an infant. This stage spectates some of the major developments in the child such as the formation of the blood cells, bones turning hard, sense organs being developed and the fingernails are also visible by this stage.