PSY210H1 Chapter Notes - Chapter 4: Primitive Streak, Apgar Score, Umbilical Cord
Document Summary
Rush of testosterone: end of 3rd month (first trimester) sex organs are visible via ultrasound. 3 months, 3 ounces, 3 inches: second trimester heartbeat becomes stronger, digestive and excretory system develops. Fingernails, toenails, buds for teeth and hair grows. Neurogenesis and synaptogenesis occurs brain begins to have folds. Age of viability development when a fetus born far too early can become a baby who is able to survive: final trimester. Lungs begin to expand and contract, and breathing muscles are exercised as the fetus swallows and spits out amniotic fluid. Increase weight to up to 7. 5 pounds on average. 30-week-old fetus weighing only 1 000 grams: causes, can be caused by maternal drug use (psychoactive drugs and tobacco, can also be caused by malnutrition, social network attitudes to the pregnancy. Immigrant paradox immigration face difficulties of acquiring jobs so ses is lower which can cause lbw: food insecurity also increases lbw, chronic illness.
