17Fetal Blood SupplyThe blood from the mom and the embryo NEVER mix. Materials diffuse between the mother’s blood & the baby’s blood.
18Umbilical CordThe umbilical cord is responsible for carrying nutrients and oxygen to the developing fetus, and waste away.
19PlacentaThe placenta is the organ that allows for the exchange of nutrients and wastes (DIFFUSION OF NUTRIENTS)
20STRUCTURES BY 3rd WEEK Placenta PlacentaNervous and endocrine system (starting)Vital organs formingHeart is beating
21FIRST TRIMESTER (3months) Most major organs formedUmbilical cord formedMuscular system developedReflexesAmnion formed
22SECOND TRIMESTER Tissues become specialized Skeleton forms Strong fetal heartbeatAt ~6 months the baby can live outside the mom with life support
233rd Trimester Fetus doubles in size Lungs are forming Sleeps 90-95% of the timeDreamsPremature if born before 8 months
24What happens at around 9 months? The fetus has developed all its organs and is ready to live in the outside worldThe uterine muscles begin to contract and the baby is forced out of the mother.This process is called:Labor
25Prenatal care Good nutrition Moderate exercise No smoking No drugs, prescription or illegalNo alcohol
27Fetal Alcohol Syndrome (FAS) Consuming alcohol during development can cause FAS which has disastrous affects on the CNS.Includes:Low birth weightSmall craniumOrgan dysfunctionFailure to thriveDevelopmental delays
28What trimester is the most dangerous? The first trimester, because all the organs are forming at this time. Dangerous chemicals can affect cell division.