Prenatal Development. Zygote: conception to 2 weeks

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Presentation transcript:

Prenatal Development. Zygote: conception to 2 weeks Prenatal Development *Zygote: conception to 2 weeks *Embryo: 3 weeks – 8 weeks *Fetus: 9 weeks to birth

ZYGOTE: conception to 2 weeks

EMBRYO: 3 weeks – 8 weeks

FETUS: 9 weeks to Birth

4 months …..the PLACENTA continues to transfer nutrients/oxygen from mother to fetus and screens out many potentially harmful substances…….TERATOGENS are harmful agents such as drugs/viruses.

ALCOHOL… Fetal Alcohol Syndrome

Facial Features

NICOTINE

Flu Virus: Studies indicate if a pregnant woman contracts the flu during the 1st trimester there is an increased risk of developing schizophrenia in the child by 700%, flu in the 3rd trimester increases the risk by 300 %...........approximately 14% of schizophrenia cases seem to have been caused by the influenza virus during pregnancy.