In some cases, a mother who is HIV AIDs positive does not pass the virus unto the unborn/born child. Explain why this is so, by studying the exchanges at the placenta.
One reason why a mother who is HIV/AIDS positive may not pass the virus on to her unborn or born child is due to the placenta acting as a barrier that can prevent the transmission of the virus. The placenta is a complex organ that acts as a filter between the mother and the fetus, allowing essential nutrients and oxygen to pass through while blocking harmful substances such as viruses.
In the case of an HIV positive mother, the virus can sometimes be blocked from crossing the placental barrier and infecting the fetus. This may be due to the mother having a low viral load, which means there is a lower concentration of the virus in her bloodstream, making it less likely to be transmitted to the baby. Additionally, some mothers may have a naturally stronger immune response that can help prevent the virus from crossing the placenta.
It is important to note that while transmission of HIV from mother to child can be prevented in some cases, it is not guaranteed. Pregnant women who are HIV positive should still receive antiretroviral therapy to reduce the risk of transmission to their baby. Additionally, medical interventions such as cesarean section delivery and formula feeding may also be recommended to further reduce the risk of transmission.