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Early Development of the Zygote to a Blastocyst (1st Week)

Implantation Of The Blastocyst Into The Uterine Lining (2nd Week)

The Developing Fetus

Features of the Circulatory System of the Developing Fetus:

Placenta is the Fetal Gas Exchange Organ → Fetal Lungs are Non-Functional

Importance of Pulmonary Circulation

At Birth the Placenta is Replaced by Lungs as the Organ of Gas Exchange

Structure of the Placenta

Function of the Placenta

Maternal Physiology

Effect of Pregnancy on Aspects of Maternal Physiology

(1) Changes in Thermal Balance

(2) Changes in Cardiac Output and Blood Volume and their Significance

Birth

Hormonal Changes During And After Pregnancy

Human Chorionic Gonadotrophin hCG Hormone

Progesterone and Oestrogen

Oxytocin causes Uterine Contraction (Birth)

Lactation and Prolactin