Question

Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

• A. Graafian follicle
• B. Fetus
• C. Corpus luteum
• D. Uterus

Answer 1

The correct option is C

Corpus luteum

The correct option is C.

Explanation of the correct option:

1. Every single month in women of reproductive age, a cyst called the corpus luteum develops on the ovary.
2. This cyst is a group of cells located in the ovary that develops with each menstrual cycle.
3. It works as soon as an egg leaves your ovary (ovulation).
4. Relaxin is generated largely by the corpus luteum, in both pregnant and nonpregnant females.
5. During pregnancy, its plasma levels are at their peak.
6. The decidua and placenta both produce relaxin under this state. In men, relaxin is produced in the prostate and secreted in the seminal fluid.

Explanation of the incorrect options:

Option A:

1. The follicle that ruptures and releases the ovum during the ovulatory phase is known as a Graafian follicle since it is completely developed.
2. The corpus luteum, which secretes progesterone and is necessary for maintaining pregnancy, develops from the Graafian follicle after ovulation.
3. Graafian hairs are fluid-filled, spherical vesicles with an oocyte attached to their wall that is found in the ovaries of mammals and is in charge of the ovary's synthesis of estrogen.

Option B:

1. The unborn young of any vertebrate species, particularly a mammal, once it has developed the fundamental shape and structure typical of its kind, is known as a fetus.
2. The levels of hormones like estrogens, progestogens, cortisol, prolactin, thyroxine, etc. rise manifold in the mother's blood during pregnancy since fetal growth depends on the increased synthesis of these hormones.

Option D:

1. Between the bladder and the rectum in the female pelvis, the uterus is a hollow, muscular structure.
2. The eggs that pass through the fallopian tubes are created in the ovaries.
3. The egg can be fertilized and implanted in the uterine lining after it has left the ovary.

Final answer: The structure that secretes the hormone, relaxin, during the later phase of pregnancy is the corpus luteum.