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Notes on NCERT for Class 12 Biology Chapter 3 Reproductive Health
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Parturition And Lactation - Biology Notes Class 12

Last Updated : 22 May, 2023
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Parturition And Lactation: Several intricate physiological processes, such as fertilisation, implantation, gestation, and delivery, are involved in human reproduction. The act of giving birth, often referred to as parturition, is a significant occasion that signals the conclusion of pregnancy and the start of a new life. Following parturition, the mother produces and secretes milk to nourish the baby during the lactation period. We shall go into great detail on the ideas of lactation and parturition in this essay.

What is Parturition?

  • The act of removing the foetus from the mother's womb is known as parturition. The foetus is expelled through the birth canal after a series of physiological processes that prepare the mother's body for labour. The stimulation of the hypothalamus-pituitary-adrenal (HPA) axis in response to different hormonal and environmental stimuli starts the parturition process.

Parturition can be separated into three stages, which are as follows:

  1. Regular contractions signal the start of the first stage, which concludes with the cervix's full dilatation. The cervix gradually thins out and dilates during this stage, enabling the foetus to pass through the birth canal.
  2. The second stage starts after the cervix has fully dilated and ends when the foetus is delivered. The mother goes through strong contractions at this time, which aid in moving the foetus through the birth canal.
  3. The third stage starts after the foetus is delivered and finishes with the placenta being expelled. As the uterus continues to contract, the placenta will eventually separate from the uterine wall and leave the body.

Hormonal Control of Parturition:

  • A complex interaction of hormones, including oestrogen, progesterone, oxytocin, and prostaglandins, regulates the parturition process.
  •  Labour starts when progesterone levels start to fall and oestrogen levels start to rise in the final weeks of pregnancy. Uterine contractions cause the release of oxytocin, which in turn causes further contractions. 
  • By softening and dilating the cervix, prostaglandins also play a significant role in the beginning and development of labour.

What is Lactation?

  • The process of making and secreting milk from the mammary glands to feed the infant is known as lactation. It is critical for the infant's growth and development and is an important part of postnatal development.

Stages of lactation: There are two stages to lactation, which are as follows: 

  1. The growth of the mammary glands and the formation of colostrum, a nutrient-rich fluid that supplies the child with necessary nutrients and immunological components, are characteristics of the first stage, or lactogenesis I, which starts during pregnancy.
  2. After parturition, the second stage, also known as lactogenesis II, starts, which is distinguished by the generation of mature milk. All the nutrients and immunological components required for the growth and development of the newborn are present in mature milk.

Hormonal Control of Lactation:

  • A complex interplay of hormones, including prolactin, oxytocin, and oestrogen, regulates lactation. The pituitary gland releases prolactin in response to sucking, which increases milk production. 
  • Sucking or nipple stimulation causes the release of oxytocin, which increases milk ejection. 
  • By encouraging the growth and development of the mammary glands, oestrogen also plays a significant role in lactation.

Conclusion:

  • Parturition and lactation are essential physiological processes that ensure the survival and well-being of the newborn. 
  • The process of parturition is controlled by a complex interplay of hormones that prepare the mother's body for labor and delivery, while lactation is controlled by a different set of hormones that promote milk production and ejection. Understanding the processes and hormonal control of parturition and lactation is crucial for the health and well-being of both the mother and the newborn.
  • It is important to note that both parturition and lactation can have potential complications and challenges. For example, difficulties during labor may require medical intervention such as a cesarean section. 
  • Similarly, lactation problems such as insufficient milk supply or improper latch can lead to feeding difficulties for the newborn. It is essential to seek medical advice and support if any problems arise during parturition or lactation.

In summary, parturition and lactation are critical events in human reproduction that require a complex interplay of physiological and hormonal processes. Understanding these processes is crucial for the health and well-being of both the mother and the newborn, and seeking medical advice and support can help overcome any potential complications and challenges.


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Notes on NCERT for Class 12 Biology Chapter 3 Reproductive Health

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