IB Biology Topic D3.1.19 Hormonal Control of Pregnancy and Childbirth Revision Notes (HL)

IB Biology Topic D3.1.19 Hormonal Control of Pregnancy and Childbirth Revision Notes (HL) | RevisionDojo

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Progesterone Keeps the Pregnancy Going, Then Its Fall Triggers Birth

Progesterone is the hormone that maintains pregnancy, and its withdrawal near term lets labour begin.

How Progesterone Maintains the Pregnancy

Progesterone keeps the endometrium thick and glandular so the embryo stays implanted.
It also inhibits uterine contractions, keeping the uterus quiet through most of pregnancy.
During early pregnancy the corpus luteum in the ovary secretes the progesterone.
1. If this secretion stops early, the lining sheds and the pregnancy ends.
From about week 9 the placenta takes over progesterone production for the rest of pregnancy.
1. If placental progesterone falls too soon, miscarriage can occur.

Tip

Read progesterone as the do not contract signal to the uterus.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Progesterone Keeps the Pregnancy Going, Then Its Fall Triggers Birth

Progesterone is the hormone that maintains pregnancy, and its withdrawal near term lets labour begin.

How Progesterone Maintains the Pregnancy

Progesterone keeps the endometrium thick and glandular so the embryo stays implanted.
It also inhibits uterine contractions, keeping the uterus quiet through most of pregnancy.
During early pregnancy the corpus luteum in the ovary secretes the progesterone.
1. If this secretion stops early, the lining sheds and the pregnancy ends.
From about week 9 the placenta takes over progesterone production for the rest of pregnancy.
1. If placental progesterone falls too soon, miscarriage can occur.

Tip

Read progesterone as the do not contract signal to the uterus.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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End of article

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D3.1.19: Hormonal Control of Pregnancy and Childbirth Notes

Progesterone Keeps the Pregnancy Going, Then Its Fall Triggers Birth

How Progesterone Maintains the Pregnancy

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Progesterone Keeps the Pregnancy Going, Then Its Fall Triggers Birth

How Progesterone Maintains the Pregnancy

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics