MEDICAL PHYSIOLOGY

Detailed explanation-1: -A: A pregnant woman is connected to the fetus by an organ called the placenta, which passes along things that the woman eats, drinks and breathes. When smoking during pregnancy, chemicals from the cigarette such as nicotine, carbon monoxide and tar are passed to the fetus through the placenta.

Detailed explanation-2: -Smoking can cause placenta previa (a dangerous situation where the placenta covers the cervix). It can cause a placental abruption (where the placenta separates from the wall of the uterus denying oxygen to your baby). It increases your risk of a preterm birth.