Chapter 10 pt. 1 Flashcards
What are the three main stages of prenatal development?
- germinal
- embryonic
- fetal
The Germinal Period occurs from __-__ weeks.
0-2
What happens during the Germinal Period?
- initially formed cell begins to rapidly divide and multiply
- zygote migrates to uterus and implants on wall
- placenta is formed
The Embryonic Period occurs from __weeks to __ months.
2
2
What is formed during the Embryonic Period?
most of vital organs (heart, spine, brain)
Explain the steps that happen during the Embryonic Stage.
- embryo at about 2 weeks, neural tube just formed
- just 5 days later, moved into Embryonic Stage
- end of the Embryonic Stage
The Fetal Period happens from __ months to birth.
2
The age of viability occurs in the _____ stage.
fetal
What is the age of viability?
basically the point in which a child can survive outside of the womb
What occurs during the fetal period?
- muscles and bones develop
- sex organs develop in the 3rd-month
- auditory system (peripheral) developed around 6 mo.
- neural development continues
When does the age of viability occurs?
23-26 weeks
At __ weeks 50% survival, if born prematurely.
At 26 weeks __% survival, if born prematurely.
23
75%
At 23 weeks __% survival, if born prematurely
At __ weeks 75% survival, if born prematurely
50%
26
True or False: The earlier that damage occurs, the worse off the individual will be.
True
What are the two main risk factors that affect pregnancy?
- Malnutrition
2. Air pollution