✨PARTURITION & LACTATIONS (PQs) Previous Questions Explained|| Best NEET Biology Online Classes

Añadido: 2026-05-11

[00:00:02]Yes. Let next let us have a look of 123rd question. Let us see this. Which of these is not an important component of initiation of puration in the humans?

[00:00:14]Right? Initi in initiation of puration.

[00:00:17]So that means the factors which initiate the delivery process in the females is known as in initiation of the puration.

[00:00:25]So generally this puration process is neuroendocrine reflex. This is neuroendocrine reflex because the nervous system is going to involve this particular process as well as endocrine system also going to involve in this paturation process. That's what this particular puration process we call it's a neuroendocrine reflex right neuroendocrine reflex. So initially the placenta along with the embryo they are going to they're going to they're going to initiate the puration process. As a result some mild contraction generally occur in the uterus walls. As a result these mild contraction in the uterus they're going to initiate the pituitary gland. As a result more amount of oxytocin is going to be secreted from the pituitary gland. In turn this particular oxytocin which is secreted by the pitutary gland. this particular oxen is going to act on the uterral wall that is the myometrum that is a mid layer of the uterus. So this myometrum is going to be contracted very stronger. So as a result so baby is being pushed towards the birth canal at the same time again more amount of oxtoin if there are strong contractions occur in the uterus more amount of oxytocin is going to be released from the posterior pituitary.

[00:01:41]So some more stronger contractions occur in uterus walls. So as a result they del going to be occur right let us see that.

[00:01:48]So initiation of parturation in the humans release of prolactin here if you observe the observe this particular hormone prolactin. So prolactin is not at all going to play any kind of any sort of role in the puration process.

[00:02:01]Now absolutely we can say this is the wrong wrong option increase in estrogen and progesterone ratio. So this is right one but it is it is not been given in our textbook and synthesis of prostag glandins. So this also initiates the puration process but it is also not given in our textbook. So when we are coming across the particular male and female reproductive system we can come across these prostaglandins. So these prostaglandin they help in the contraction of uterus. There we can come across but it has not been given in our textbook. So this is also right option and this is also right option and release of oxtoen this only the option which is given in our textbook right. So oxytocin blindly we can say this is the right one. So we can say these three are these three are right and whereas the release of prolactin is the wrong answer which is not at all related with the puration process. Right. So this was the question which was asked in 2021 and let us switch on to the next one. So which of these is not an important component of initiation of puration in humans? So same question again it was asked in 2015 but it was cancelled right let us check the next one.

[00:03:15]The fetal ejection reflex right the fetal ejection reflex in humans triggers the release of release of oxytocin.

[00:03:24]Oxytocin release of oxytocin oxytocin from fetal pituitary. This is wrong one because the oxytocin is not going to be released from the fetal pitutary. So this oxtocin is going to release from the mother's pitutary gland but not from the pituitary of the fetus. Right? Human corani gonadotroofen from the placenta.

[00:03:45]So this is not going to this is not going to what is say this is not going to uh this this is not going to play a vital role in the patch process because hCG is a hormone. It sees the hormone which is released by the placenta which accommodate the pregnancy and it sees that the pregnancy should continue. So this is not the right one and human placenta lactogen from the placenta.

[00:04:10]Oxytocin from the maternal pittor. So this is the right option here. The oxytocin from maternal pit. So these are the both hormones hCG and HPL which are released by the placenta which sees that the pregnancy should continue in a proper and healthy way. So that's what these two hormones are released from the placenta. So now so if the more amount of hygien HPL are present in the blood of the mother so there is no initiation of this particular puration process. Now oxytocin itself it's going to initiate the patch process. Okay. And this was the question which was asked in 2013.

[00:04:47]And let us check the next one that is signals for puration originate from. So just now we discussed these signals are initiated by the placenta as well as the embryo. So these two structures embryo as well as placenta these are going to initiate the signals initiate the puration process. So after signals come this particular these two structure that is placenta and embryo. So what happened there is a mild there are mild contractions occur generally in myometrium of the uterus. So as a result so the oxytocin is going to be secreted from the posterior pituitary and after releasing the this oxytocin from the posterior pitutary this oxytocin is going to act on the myometrium. So as a result stronger contraction starts in the uterus in the uterral wall. So ultimately which leads to the delivery of the baby right. So signals for puration originate from originate originate means here initial starting initially starting from starting from both placenta as well as a fully developed fetus oxytocin released from maternal pituitary placenta only fully developed fetus only here. So both these so both placenta as well as a fully developed this is very clearly given in our textbook okay and then next switch on to the next one we'll switch signals from fully developed fetus and placenta ultimately lead to purration which requires the release of release of which requires the release of estrogen from placenta oxytocin from maternal pitutary oxytocin from fetal pituitary relaxing from placenta actually relaxing it is not released from placenta.

[00:06:27]Relaxin is the hormone which is released from the carpus lutium from the ovaries.

[00:06:32]This particular relaxin is the hormone which is useful for the freeing or else loosen the ligaments of the particular this pelvic girdle. Right? So this is the relaxing hormone. So leave it about that. So here signals from fully developed fetus and placenta ultimately lead to puration which requires the release of oxytocin from the posterior pituitary of the mother. So now the oxygen from maternal picture this is the right option here.

[00:06:59]Now let us see the next one.

[00:07:02]Fetal ejection reflex fetal ejection reflex in human females is induced by again this was asked fully deop fetus and placenta. This is the right answer.

[00:07:10]So again this was asked in 2009. So this particular topic is very little topic and so so very easy one. So here we have to remember that a puration process is a neuroendocrine reflex and how it is going to be happen. So we should know the particular process and after that lactation and memorary glands maturation and the and the cholesterol we have to remember all these very few things we have to remember right. Next one is uh this one is over and 129. In human adult females oxytocin in human adult female oxtoin stimulates pitutary to sacred vasopressin causes strong uterine contractions during repuration is secreted by anterior pitutary stimulates growth of mammary glands. Here we have to think so only the oxtoin is a hormone which acts on the myometrium of the uterus utterus.

[00:08:02]So in order to make a very stronger contractions. So at the time of puration process here the it causes this particular oxytocin which is secreted from posterior pitary. See here it is secreted by anterior pituitary. So in this statement we can observe this is the wrong word which is given here anterior but it is not secreted by the anterior pituitary. If it would be posterior then it would be the correct answer but it is anterior piter has been has been given here. So it is the wrong option. So this particular oxygen which is secreted from the posterior posterior lobe of the posterior part of the particular this pituitary gland it is going to stimulate or causes a strong uterine contractions during the puration process. Right? This is the correct one.

[00:08:48]So these are the few questions which were asked from the pituitary. So puration as well as from the lactation process. Right?

[00:08:56]And next uh in the next session we'll meet in the next session. Till next session have a great day.