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These hormones are progesterone and estrogens. They are actually secreted by the placenta, in increasing amounts as the fetus matures: (Colorado State, R. Bowen) You can see that the placenta produces both types of hormone in increasing amounts until birth. Additionally, the hormone relaxin is secreted by the placenta and thought to aid in parturation: ...


Renin angiotensin is for regaining homeostasis. If you have lost salts, blood pressure and blood volume will decrease due to loss of fluids. But the renin angiotensin mechanism will try to undo this by stimulating uptake of Na+ and water. But still, they can not fully compensate for loss of Na+, INTAKE of Na+ is NECESSARY. By the way, the main stimulus for ...

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