CP 4, Prenatal Development
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18 terms
Terms | Definitions |
|---|---|
 What is the Germinal Period? | First 14 days after fertilization. Ends with implantatio. Has a 66% failure rate. Cells divide many times. Cannot detect pregnancy here. |
| What is the Embryonic Period? | Weeks 3 through 8. Starts with implantation. Embryo recieves nourishment. Basic body develops. |
| How much does a embryo weigh at 8 weeks? | 1 gram, three paperclips and is about 1 inch. |
| What is the Fetal Period? | Week 9 to birth. Very rapid development. 1g - 3000g. |
| What happens in the 3rd months of the Fetal Period? | Sex organs develop, major systems are all present, first movement. |
| What happens during the 4th, 5th and 6th months? | Preparing to survive. Digestive, heart, and respiratory systems develop. Getting fat! |
| What is the Age of Viability? | 22 Weeks (beginning of fourth month), fetus can survive in hospital (ICU). |
| Why is brain function vital? | Lower brain areas produce "automatic" functions - Breathing, sucking. |
| What is Synaptogenesis? | Synapse creation. "use it or lose it" - Neurons that form connections are nourished and live. |
| What happens in the last 3 Months? | Respiratory and cardio systems continue to prepare for life outside. Lots of movement (muscle training) Sleep/wake cycles develop. Lots of fat (maternal nutrition important). |
| What are Teratogens? | Substances or conditions that can cause prenatal damage. Some can alter brain development. |
| What are the factors of damage? | Timing, Amount, Genes. |
| What is LBW? | Low birth weight, less than 5 1/2 lbs. Grows too slowly or weighs less than normal. More common then 10 years ago. Second most common cause of neonatal death. |
| What is Preterm? | Birth occurs 3 or more weeks before standard 38 weeks. |
| What is Kangaroo Care? | Holding newborn against skin for at least an hour a day. Decreases infant stress. Increases suckling. Increases immune response. |
| What is the Threshold effect? | Level at which a substance becomes a toxin. I.E: Vitamin A. |
| What is the Interaction Effect? | Some teratogens when combined become more teoxic. I.E: Alcohol and Tobacco. |
| What is the Apgar Scale? | Five factors - Score of 7 or better = Normal, Score under 7 = Needs help breathing, Score under 4 = Needs urgent critical care. |
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