Fimbriae (common pili) and flagella on the surface of bacterial cells. Left: dividing Shigella enclosed in fimbriae. The structures are probably involved in the bacterium's ability to adhere to the intestinal surface. Right: dividing pair of Salmonella displaying both its peritrichous flagella and its fimbriae.
Relaxin's peak is reached during the 14 weeks of the first trimester and at delivery. It is known to mediate the hemodynamic changes that occur during pregnancy, such as increased cardiac output, increased renal blood flow, and increased arterial compliance.
15. For so many expectant mothers, feeling the baby kick is one of the most anticipated experiences of pregnancy as it is one of those tangible pieces of evidence of the growing body within. If you are anxious to feel your baby start moving, you should be able to have this experience by the 4 th or 5 th month. Even though this might seem like a long time to wait, rest assured that your baby has already been practicing his kicks and jabs since the first trimester.