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PARTURITION (Birth)

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)

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  1. PART 5B PARTURITION (Birth)

  2. 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.

  3. 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

  4. Parturition Oxytocin Prostaglandins Stimulates (+ feedback) Baby’s head pushes downwards Stimulates (+ feedback) Stimulates (+ feedback)

  5. (Caesarean) C-Section Typical reasons: • Breech births • Small pelvis • STI complications

  6. 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

  7. Lactation

  8. 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.

  9. Lactation BIRTH

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

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