pd2 - 2/15/10 Hazards to prenatal development Teratogens...

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2/15/10 1 Hazards to prenatal development • Teratogens – Environmental agents that cause harm during prenatal development. Teratogens • Drugs • Diseases • Environmental Hazards Teratogens Sensitive periods – Time where organism is most vulnerable to outside agents. – Each major organ system has its own sensitive period (when its basic structures are forming). – Embryonic period (week 3 to week 8) is the MOST sensitive period.
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2/15/10 2 Sensitive Periods example • 1960’s – Pregnant women took Thalidomide. – ONLY if ingested during the 4th to 6th week it caused major deformities of the arms and legs. Types of Teratogens • Drugs • Diseases • Environmental Hazards
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2/15/10 3 Drugs • Smoking – 12%-22% of women in US smoke when they are pregnant – Interferes with blood and oxygen flow to fetus – Retarded growth, low BW, increased risk for SIDS, Lower IQ, hearing deficits and cancer. Drugs
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This note was uploaded on 02/17/2011 for the course HK 253 taught by Professor Claxton during the Spring '10 term at Purdue University.

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pd2 - 2/15/10 Hazards to prenatal development Teratogens...

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