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Chapter 34: Problem 36

Before pregnancy, progesterone is produced by the ovaries to thicken the endometrial lining and ensure pregnancy. During the third trimester of pregnancy, which organ produces progesterone? a. placenta b. endometrial lining c. chorion d. corpus luteum

Short Answer

Expert verified
a. placenta

Step by step solution

01

Understanding the Hormone

Progesterone is a hormone crucial for maintaining pregnancy. It starts off being produced by the ovaries to help prepare the endometrium.
02

Hormone Production Shift

During pregnancy, the role of progesterone production shifts from the ovaries to another organ in the later stages.
03

Identify the Producing Organ

In the third trimester of pregnancy, the placenta is the primary source of progesterone production.
04

Answer Verification

Considering the function during the third trimester, the placenta produces progesterone to maintain the pregnancy.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Placenta
The placenta is a temporary organ that develops in the uterus during pregnancy. It acts as a lifeline between the mother and the fetus. The placenta provides oxygen and nutrients to the baby while removing waste products from the baby's blood. This organ also produces several hormones essential for maintaining pregnancy.
The placenta's role is critical as it takes over the production of progesterone from the ovaries. This shift usually occurs around the end of the first trimester. Progesterone is vital because it helps maintain a healthy uterine lining and prevents contractions that could lead to premature labor.
Besides progesterone, the placenta produces other hormones like human chorionic gonadotropin (hCG) and estrogen. These hormones support fetal development and prepare the mother's body for childbirth and breastfeeding.
Third Trimester
The third trimester of pregnancy spans from week 28 to week 40. This period is crucial for the final growth and development of the baby. The baby gains most of its weight during this time, and the organs mature to prepare for life outside the womb.
The mother's body also undergoes significant changes in the third trimester. One of the most important changes is the shift in hormone production to the placenta. This shift is crucial for maintaining a healthy pregnancy.
During the third trimester, the placenta not only provides nutrients and oxygen but also produces high levels of progesterone. This helps to relax the uterine muscles, preventing premature contractions and ensuring that the baby remains in the womb until it is fully developed.
Hormone Production Shift
The hormone production shift is a critical aspect of a healthy pregnancy. Initially, progesterone is produced by the ovaries. This helps thicken the endometrial lining, preparing it for implantation and supporting early pregnancy.
As pregnancy progresses, especially after the first trimester, the source of progesterone shifts from the ovaries to the placenta. This transition is essential for sustaining the pregnancy through the third trimester.
The placenta produces higher levels of progesterone to ensure the uterine lining remains thick and healthy. This prevents the uterus from contracting prematurely, which is crucial for the baby's continued growth and development.
The hormone production shift also prepares the mother's body for labor and breastfeeding, making it an integral part of a successful pregnancy.

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Most popular questions from this chapter

Which female organ has the same embryonic origin as the penis? a. clitoris b. labia majora c. greater vestibular glands d. vagina

How does the feedback mechanism of hormones lead to muscular contractions during labor? a. A feedback relay occurs between the uterus, hypothalamus, and posterior pituitary to assure an adequate supply of oxytocin, which causes the contraction of smooth muscles of the uterus, leading to the birth of the baby. b. The posterior pituitary continuously produces oxytocin, which is sufficient for muscular contraction in the uterus, thereby causing the birth of the baby. c. A feedback relay occurs between the uterus, hypothalamus, and posterior pituitary to assure an adequate supply of prolactin, which causes the contraction of the smooth muscles of the uterus, leading to the birth of the baby. d. A feedback relay occurs between the uterus, hypothalamus, and posterior pituitary to assure an adequate supply of progesterone, which causes the contraction of the smooth muscles of the uterus, leading to the birth of the baby.

In sexual reproduction, two cells of a species combine to form another cell. Why is this useful? a. It produces new combination of genes, which enables offspring to survive during environmental changes. b. It results in the production of many offspring in a short period of time. c. It does not involve gamete formation and requires less energy. d. It allows immobile organisms to reproduce in the absence of a mate.

In both males and females, the hormones FSH and LH play a critical role in the reproductive phase. What regulates the secretion of these hormones? a. GnRH b. estrogen c. progesterone d. inhibin

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