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Figure

As is illustrated in the section of villus (lower part of figure), the placental membrane consists of the epithelial wall of an embryonic capillary and the epithelial wall of a chorionic villus.

Umbilical cord —

Umbilical arteries

Umbilical vein

Chorion-

Lacuna

Embryonic blood vessels

Umbilical cord —

Umbilical arteries

Umbilical vein

Chorion-

Blood Vessels

Maternal blood vessels

Villi

(embryonic portion of placenta)

Decidua basalis (maternal portion of placenta)

Maternal blood vessels

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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