Presentation on theme: "Aim: How does an embryo develop inside the uterus? Do Now: Explain the difference between internal and external fertilization and development. Which one."— Presentation transcript:
Fetal Blood Supply The blood from the mom and the embryo NEVER mix. Materials diffuse between the mother’s blood & the baby’s blood.
Umbilical Cord The umbilical cord is responsible for carrying nutrients and oxygen to the developing fetus, and waste away.
Placenta The placenta is the organ that allows for the exchange of nutrients and wastes (DIFFUSION OF NUTRIENTS)
STRUCTURES BY 3rd WEEK http://www.ehd.org/movies.php?mov_id=9http://www.ehd.org/movies.php?mov_id=9 Placenta Nervous and endocrine system (starting) Vital organs forming Heart is beating
FIRST TRIMESTER (3months) Most major organs formed Umbilical cord formed Muscular system developed Reflexes Amnion formed
SECOND TRIMESTER Tissues become specialized Skeleton forms Strong fetal heartbeat At ~6 months the baby can live outside the mom with life support
3rd Trimester Fetus doubles in size Lungs are forming Sleeps 90-95% of the time Dreams Premature if born before 8 months
What happens at around 9 months? The fetus has developed all its organs and is ready to live in the outside world The uterine muscles begin to contract and the baby is forced out of the mother. This process is called:Labor
Prenatal care Good nutrition Moderate exercise No smoking No drugs, prescription or illegal No alcohol
Fetal Alcohol Syndrome (FAS) Consuming alcohol during development can cause FAS which has disastrous affects on the CNS. Includes: Low birth weight Small cranium Organ dysfunction Failure to thrive Developmental delays
What trimester is the most dangerous? The first trimester, because all the organs are forming at this time. Dangerous chemicals can affect cell division.