Describe the hormonal role of the placenta. (page 378 ) |...

Name: Problem 8, Chapter 16: Human Biology
Uploaded: 2021-12-25T06:09:04-08:00
Duration: 1 min 57 s
Channel: Parvati Devi
Description: Describe the hormonal role of the placenta. (page 378 )

Key Concepts

Placenta as an Endocrine Organ

The placenta functions as a critical endocrine organ during pregnancy, secreting a number of hormones that regulate both maternal and fetal physiology. It plays a central role in mediating communication between the mother and the developing fetus by releasing hormones into the maternal circulation to support pregnancy and fetal development.

Hormonal Regulation of Pregnancy

Hormonal regulation during pregnancy involves coordinated actions of various hormones to maintain the uterine environment, promote fetal growth, and facilitate maternal adaptations. These hormones work in concert to ensure that the maternal body undergoes the necessary changes to support a healthy pregnancy and prepare for parturition and lactation.

Human Chorionic Gonadotropin (hCG)

hCG is one of the first hormones produced by the placenta, essential for the early maintenance of pregnancy. It supports the corpus luteum, ensuring that progesterone production continues until the placenta is sufficiently developed to take over this role, thereby sustaining the uterine lining and preventing menstruation.

Progesterone

Progesterone is a hormone produced initially by the corpus luteum and later predominantly by the placenta. It is crucial for maintaining the uterine lining, preventing uterine contractions, and creating a stable environment for the developing fetus throughout gestation.

Estrogens

Estrogens are synthesized by the placenta and are important in promoting uterine blood flow and stimulating the growth of the uterus. They also help regulate other key functions during pregnancy, including the modulation of maternal immune responses and the preparation of the maternal body for childbirth.

Human Placental Lactogen (hPL)

Human placental lactogen (hPL) is a hormone produced by the placenta that modifies maternal metabolism. It helps redirect nutrients to the fetus by altering insulin sensitivity and promoting lipolysis, and also contributes to the development of the mammary glands in preparation for lactation.

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