Now, this is produced by the placenta and it plays two very important functions. Firstly, it basically controls and regulates the concentration, the level of glucose, fatty acids and amino acids in the blood plasma of the mother. And this is done to basically ensure that the fetus has a constant supply of energy that it basically needs to grow and develop. And it also stimulates the enlargement of the memory glands, which are the glands that basically produce and secrete the milk that the child needs following childbirth. Now, let's move on to the fifth type of hormone, which is once again a peptide hormone. This is relaxant.