Question

Function of relaxin hormone is to
A. Relax pubic symphysis
B. Relax ovaries
C. Relax uterus
D. Relax fallopian tubule

Answer 1

Relaxin hormone is secreted by the corpus luteum in the ovary and this hormone relaxes muscles and loosens ligaments and joints mainly in the pelvic area.

Complete answer:
Relaxin is a hormone which is secreted in the ovary by the corpus luteum in small quantities during each menstrual cycle. It has important effects in the female reproductive system and during the pregnancy. During pregnancy, relaxin hormone is released by the placenta to keep the uterine smooth muscle relaxed. During child birth or parturition, relaxin hormone is released in large quantities by placenta in order to loosen the ligaments in the pelvis which in turn softens and widens the cervix to facilitate the child birth. Therefore, the main function of relaxin hormone is to relax the pubic symphysis.
If we look at options now, Last option D is the Relax fallopian tube. It is an incorrect option since relaxin hormone does not relax the fallopian tube but it relaxes pubic symphysis during the time of parturition and therefore this option is incorrect and it gets eliminated.
Moving to option C which is Relax uterus. It served to relax the uterus, but it's main function is not to relax the uterus but its function is to relax the pubic symphysis and therefore this option is incorrect and it gets eliminated.
Moving to option B which is Relax ovaries, this option is also incorrect since this relaxin hormone is secreted in the ovary but not to relax the ovary but to relax the pubic symphysis and therefore this option also gets eliminated.
Option A is Relax pubic symphysis, this option is the correct one because during the parturition relaxin hormone is released in large quantities in order to relax the pubic symphysis which in turns widens the cervix for childbirth. Therefore, this option is correct.

Thus, the correct option is A which is Relax pubic symphysis.

Note: Relaxin hormone as the name indicates functions to relax but during pregnancy, it is released to relax the uterine smooth muscles and during childbirth, it is released to relax the pelvic symphysis and due to this hormone the cervix becomes widen and soften and therefore it facilitate the child birth.