PSY 223 1st Edition Lecture 2Prenatal Development and BirthThe Prenatal Period• Germinal period• Embryonic period• Fetal periodFetal Growth from 8-40 Weeks Conception• Two reproductive cells (gametes) fuse and become one • A zygote is formed• Duplication, Division, and Differentiation begin•Germinal Period• The first 14 days• Implantation- if the egg doesn't implant then nothing happens “Hazardous journey” - a majority of cells will not make itEmbryonic Period• From 3rd through 8th week• Head• Heart• Arms and Legs• Becoming a tiny human- basic organs and body parts form in different gonad forms even though the chromosomes are there Fetal Period: Months 3 through 6• Sexual organs• Digestive and excretory systems• Brain growth- dramatic formation of neurons and synapses Fetal Period: Months 6-9• Weight gain- put on 4.5 to 5lbs• Respiratory system- practice breathing with amniotic fluid• Cardiovascular system• Mother-child relationshipThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Vulnerability During Prenatal Development• Germinal Period: ~60% fail to grow/implant• Embryonic Period: ~20% Spontaneously aborted• Fetal period: ~5% are spontaneously aborted or stillbornIssues arise when lungs don't fully develop (physical and cognitive
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