The statement that is not true regarding the effects of alcohol on a pregnant woman is:
"the uterus separates the fetus from the outside world and fully protects it from whatever drugs the mother happens to be using."
This statement is misleading because while the uterus does provide a physical barrier, it does not fully protect the fetus from substances that the mother consumes, including alcohol and other drugs. These substances can cross the placenta and affect the developing fetus.