Prenatal Development

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first

all 3 periods occur during which trimester of pregnancy

decreasing

birth rate among US teenagers has been BLANK - 40% since 1991

movement of child

by 4 months a mother can sometimes feel

swallows and urinates

by three months the fetus BLANKS AND BLANKS

uterus

during germinal stage - fertilized egg (blastocyst) travels toward the BLANK where it becomes implanted into the wall which is rich in nutrients

fetal stage

final period of prenatal development

25

first time fetus has chance of surviving outside of womb is about BLANK weeks of age

hormones

in weeks 8 to 24 following conception, BLANKS are released that lead to increasing differentiation of male and female fetuses

birth

in western cultures - BLANK is considered to be beginning of life

mesoderm

layer of embryo that forms muscles, bones, blood, and circulatory system

endoderm

layer of embryo that produces digestive system, liver, pancreas, and respiratory system

ectoderm

layer of embryo that will form skin, hair, teeth, sense organs, and brain and spinal cord

embryonic stage

period form 2-8 weeks following fertilization

embryonic

period of prenatal development - 2-8 weeks after conception - organs appear

germinal

period of prenatal development - creation of zygote - ends with implantation

fetal

period that begins 2 months after conception

trimesters

prenatal development is divided into 3 periods and 3 BLANKS

germinal stage

prenatal stage - in addition to increasing in number, cells of organism become increasingly specialized

fetal stage

prenatal stage - increases in length some 20 times and proportions chance dramatically

germinal stage

prenatal stage - zygote begins to divide and grow in complexity during first two weeks following conception

embryonic stage

prenatal stage- development of major organs and basic anatomy

fetal stage

starts at about 8 weeks after conception and continues until birth

differentiation

the fetal stage formally starts when the BLANK of the major organs has occured

ectoderm, mesoderm, and endoderm

what are the three distinct layers of the child in the embryonic stage?

development

what characterizes the 1st trimester

rapid growth

what characterizes the 2nd trimester?

stabilization of growth

what characterizes the 3rd trimester?

germinal stage

what is the first and shortest stage of prenatal development?

germinal stage

what stage is characterized by methodical cell division

placenta

when fully developed, the BLANK serves as conduit between mother and fetus, providing nourishment and oxygen via umbilical cord - during germinal stage

embryo

when the organism is firmly secured to the wall of mothers uterus the child is called an


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