Textbook Notes (372,436)
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PSYB32H3 (1,174)
Chapter 3

Psyb20 ch3.docx

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Mark Schmuckler

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Psyb20 ch3 Parity is wheter a woman has had a child before Stages of prenatal development conception during a woman’s ovulation the zygote -the first 2 weeks of life -the fertilized egg -it implants on the wall of the uterus The embryo -lasts from the beginning of the third week of gestation until the end of the eighth week -the amniotic sac, membrane around the organisms forms, containing amniotic fluid in which the embryo floats, and the wall tendrils increase in size forming placenta -the embryo Is joined to the placenta by the umbilical cord where there is a tramittance of oxygen and nutrients to the infant, and carbon dioxide is removed -3 layers: ectoderm (hair, nails, skin teeth and nervous system), mesoderm (muscle skeleton circulatory system and excretory system) and endoderm (gastrointestinal tract, trachea bronchia, glands and vital organs) -cephalocaudal: the development proceeds form the head downward to the trunk and legs -proximal-distal:growth occurs first in central areas, as internal organs then in more distant areas -miscarriages: where the embryo detaches from the wall and expelled through vaginal canal The fetus -experiences rapid growth and muscular dev and central nervous system -end of 3 month fetus has all of its parts th -by 4 month there is movement and 5 months reflexes -the fetus will develop lanugo wich is a soft like hair that covers the body -6 months open and close eyes -they have a surfactant that allows oxygen from the air into the blood without this some fetus may develop respiratory distress syndrome -age of viability: around the age of 22 weeks to 26 weeks where if the baby is born prematurely it will still be able to survive Risk in the prenatal environment -teratogens can affect dev -the organism is most vulnerable during embryonic stage however each organ system has a different critical period -different teratogens influence different developmental processes -maternal and fetal genotypes affect the developing infant’s response to teratogenic agents and play a role in determining whether the infant displays abnormalities -the mother’s physiological status, nutrition and hormonal balance modify the impact of a teratogen -different teratogens many produce the same defect -the higher the dose the more sever the damage to the developing fetus
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