Talk:BGDA Practical 12 - Birth: Difference between revisions
From Embryology
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* hyperpolarizes myometrial cells (-65 mV), reduces excitability and conductivity | * hyperpolarizes myometrial cells (-65 mV), reduces excitability and conductivity | ||
* Level in plasma may fall just before parturition, definitely decreases following delivery of placenta | * Level in plasma may fall just before parturition, definitely decreases following delivery of placenta | ||
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| valign=top|Estrogens | | valign=top|Estrogens | ||
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* myometrium sensitivity to oxytocin (increased by estrogen, decreased by progesterone) | * myometrium sensitivity to oxytocin (increased by estrogen, decreased by progesterone) | ||
* stimulus for release - mechanical stimulation of uterus, cervix and vagina (ethanol inhibits release) | * stimulus for release - mechanical stimulation of uterus, cervix and vagina (ethanol inhibits release) | ||
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| valign=top|Prostaglandins | | valign=top|Prostaglandins | ||
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Revision as of 11:56, 2 June 2013
Practical Audio
BGD Cycle A 2010 Audio - Dr Mark Hill Monday 17th May 2010 3-5pm G2G4.
listen Part 6 | download (2.13 Mb MP3 18:36) |
Hormones | Roles |
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Progesterone |
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Estrogens |
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Oxytocin |
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Prostaglandins |
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External Environment
- mainly shown in other species parturition occurs in peaceful undisturbed surroundings, stress may have an inhibitory effect on oxytocin release
- Most human births occur at night (peak at 3am) diurnal rhythm influence