Structural and functional unit between developing embryo and maternal body is

UPPSC 2022

Obstetrics & Gynaecology

Easy

Appeared in: UPPSC 2022

Explanation

The placenta is a specialized organ that develops during pregnancy to serve as the interface between the mother and the fetus.
It facilitates all vital exchanges, including respiration (gas exchange), nutrition (nutrient transfer), and excretion (waste removal).
The placenta also functions as an endocrine organ, producing hormones essential for maintaining the pregnancy, such as hCG and progesterone.
Chorionic villi are the essential structures within the placenta involved in the exchange between maternal and fetal blood.

Option B: The fallopian tube is the site of fertilization and transports the early embryo to the uterus. It does not provide the sustained structural and functional support for the entire gestation period.
Option C: The Eustachian tube is part of the auditory system, connecting the middle ear to the pharynx. It has no role in reproduction or pregnancy.
Option D: The vas deferens is a component of the male reproductive system responsible for transporting sperm. It is not found in the female body and is unrelated to pregnancy.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Fetal-Maternal Anatomy and Physiology as background academic context rather than a clinical decision trigger.
A healthy, well-functioning placenta is crucial for a healthy pregnancy outcome. Nurses monitor for signs of placental insufficiency, which can lead to fetal growth restriction.
Placental abnormalities, such as placenta previa (low-lying placenta) or placental abruption (premature separation), are major causes of maternal and fetal morbidity and mortality, often presenting as obstetric emergencies.
Understanding placental function is key to patient education regarding lifestyle choices during pregnancy, as many substances (e.g., drugs, alcohol, nicotine) can cross the placental barrier and harm the fetus.

How to Approach the Question

First, break down the question: it asks for the 'structural and functional unit' that connects a 'developing embryo' to the 'maternal body'.
Recall the basic anatomy of pregnancy. The key process is the implantation of an embryo in the uterus and the development of a support system.
Evaluate each option based on this context.
Eliminate options that are clearly from different body systems. The 'Eustachian tube' (ear) and 'vas deferens' (male reproductive system) are incorrect.
Differentiate between the remaining female reproductive structures. The 'fallopian tube' is where fertilization happens, but the 'placenta' is the organ that develops specifically to nourish and support the fetus throughout pregnancy.
Conclude that the placenta is the only option that fits the description of a long-term structural and functional unit between mother and embryo.

Concept Tested & Keywords

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E6 Anatomy Grays 43e Vol 1 Part 2 p. 7-9

E6 Anatomy Applied Ashalatha 4e p. 389-391