SOME UNBELEIVABLE EFFECTS OF PREGNANCY THAT YOU CAN'T EVEN IMAGINE!! Muscles and joints shift and jostle.The heart's pounding rhythm speeds up.Blood roars through arteries and veins.Over the course of pregnancy,every organ in the body changes.Ignited by a range of hormones,these changes begin as soon as pregnancy begins. Just days after fertilisation,the embryo implants in the lining of the uterus.Because it's DNA does'nt exactly match the mother's,the immune system should be theoretically recognize it as an invader,attack and destroy it,like it would bacteria or other harmful microbes.That's the challenge:the mother's immune system needs to protect both her and the fetus,but can't act as it usually does.What happens is not as simole as decreasing the immune response.Instead,it's a complex interaction we're just beginning to understand,involving many different types of immune cells-some of which seem to protect the fetus from attack by other im...
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