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PART 5B . PARTURITION (Birth). Parturition: Delivery of the Baby. The birthing process or ‘labour’ Begins with uterine contractions Occurring every 15-20 mins in frequency and lasting for a duration of 40-60 sec. Parturition.

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Parturition birth

PART 5B

PARTURITION (Birth)


Parturition delivery of the baby
Parturition: Delivery of the Baby

  • The birthing process or ‘labour’

  • Begins with uterine contractions

    • Occurring every 15-20 mins in frequency and lasting for a duration of 40-60 sec.


Parturition
Parturition

  • Relaxin hormone is released by the placenta, loosening ligaments of the pelvis and softening the cervix.

  • Uterus contractions causes stretching of cervix

  • Stretching of cervix causes release of oxytocin from posteriorpituitary gland

  • Oxytocin stimulates uterine contractions and release of prostaglandins from the uterus

  • Prostaglandins cause uterine contractions

    (+) Feedback Cycle continues until baby is born


Parturition1
Parturition

Oxytocin

Prostaglandins

Stimulates (+ feedback)

Baby’s head pushes downwards

Stimulates (+ feedback)

Stimulates (+ feedback)


Caesarean c section
(Caesarean) C-Section

Typical reasons:

  • Breech births

  • Small pelvis

  • STI complications


Lactation
Lactation

  • The secretion and formation of breast milk in the mother

  • Requires the hormone prolactin

    • not secreted during pregnancy because it is high levels of estrogen and progesterone suppress production

  • Secreted by anterior pituitary following birth



Lactation and suckling
Lactation and Suckling

  • Suckling stimulates nerve endings in the nipples

  • Nerve impulse causes the hypothalamus to stimulate the posterior pituitary to secrete oxytocin

  • Oxytocin causes mammary cells to contract causing the milk glands to produce milk

  • Contractions of milk glands cause milk to be secreted through ducts through the nipple.


Lactation2
Lactation

BIRTH


Practice
Practice

  • Pg. 542-3 READ Case Study – Human Reproductive Technology

    • ANSWER #1-5

  • Pg. 544 #4