2. Identify the source of hCG and explain why this hormone is needed to maintain pregnancy for the first i0 weeks.
4. List the protein hormones and sex steroids secreted by the placenta and describe their functions.
6. Describe the hormonal interactions required for breast development during pregnancy and for lactation after delivery.
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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.