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PARTURITION (Birth)

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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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Presentation Transcript
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.
practice
Practice
  • Pg. 542-3 READ Case Study – Human Reproductive Technology
    • ANSWER #1-5
  • Pg. 544 #4
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