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https://library.med.utah.edu/kw/human_reprod/lectures/physiology_labor/
For the most part the fetus is a passive respondent in the process of labor, while the mother provides the uterine forces and structural configuration of the passageway through which the passenger must travel. For a normal mechanism of labor to occur, both the fetal and maternal factors must be harmonious.
https://obgynkey.com/physiology-of-labor/
This labor stage ends when the cervix is fully dilated—about 10 cm—to allow passage of the term-sized fetus. The first stage of labor, therefore, is the stage of cervical effacement and dilatation. The second stage begins when cervical dilatation is complete and ends with delivery. Thus, the second stage of labor is the stage of fetal expulsion. Last, the third stage begins immediately after delivery of the …
https://nursekey.com/physiological-changes-during-labour/
Oestrogen. Oestrogen has a primary role in initiating many changes that are essential for labour, and levels begin to rise at about 34 weeks gestation. Oestrogen increases the sensitivity of the myometrial oxytocin receptors during pregnancy (Blackburn 2007) and thus facilitates myometrial contractility.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1115220/
Mar 20, 1999 · Stages of labour. Labour can be divided into three stages, which are unequal in length. The fundamental change underlying the process of the first stage is progressive dilatation of the cervix. This gives rise to the familiar symptoms and signs of labour.Cited by: 17
https://www.ncbi.nlm.nih.gov/pubmed/22813360
Physiologic changes during normal pregnancy and delivery. Ouzounian JG(1), Elkayam U. Author information: (1)University of Southern California, Keck School of Medicine, Los Angeles, CA 90033, USA. [email protected] by: 224
https://open.oregonstate.education/aandp/chapter/28-4-maternal-changes-during-pregnancy-labor-and-birth/
Physiology of Labor. Childbirth, or parturition, typically occurs within a week of a woman’s due date, unless the woman is pregnant with more than one fetus, which usually causes her to go into labor early. As a pregnancy progresses into its final weeks, several physiological changes occur in response to hormones that trigger labor.
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