Psychology 237 Life Span
Embryonic period
Ovum period
Fetal period
Germinal period
Respiratory system
Umbilical cord
Brain and spinal column
Circulatory system
Virtually harmless until exposure reaches a certain level
Harmful only to low-birthweight infants
Harmful to certain developing organs during periods when these organs are developing most rapidly
Harmful only if the pregnant woman's weight does not increase by a certain minimum amount during her pregnancy
Skeleton
Elbows and knees
Sex organs
Fingers and toes
Placenta
Eyes
Brain
Skeleton
Vitamin A
Zinc
Guanine
Folic acid
Genes on the Y chromosome send a signal; no signal is sent from an X chromosome
Genes on the Y chromosome send a signal; genes on the X chromosome send a signal
Genes on the X chromosome send a signal; no signal is sent from an X chromosome
Genes on the X chromosome send a signal; genes on the Y chromosome send a signal
Cannot cross the placenta during the period of the embryo
Is usually inherited from the mother
Can be counteracted by good nutrition most of the time
May be a virus, a drug, a chemical, radiation, or environmental pollutants
Slowed physical growth and behavior problems
Addiction to alcohol and methadone
Deformed arms and legs
Blindness
When the fetus moves into the right position
When the uterus begins to contract at regular intervals to push the fetus out
About eight hours (for firstborns) after the uterus begins to contract at regular intervals
When the baby's head appears at the opening of the vagina
Only if the newborn is in obvious distress
Once, just after birth
Twice, one minute and five minutes after birth
Repeatedly during the newborn's first hours
5 lbs
6 lbs
7.5 lbs
8.5 lbs
Are classified as preterm
Are called small for gestational age
Usually have no sex organs
Show many signs of immaturity
Alcohol
Tobacco
Crack cocaine
Household chemicals
Observations in the delivery room
Data on adopted infants
Animal studies
Studies of disturbed mother-infant pairs
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