prenatal development

ovulation

when an egg is released from ovary

what day of cycle does ovulation occur

14

which hormones trigger ovulation

FSH, estrogen, and LH

how many days does it take an egg to get to the uterus

3 days

how long is an egg viable for

24 hours

how long can sperm live in the uterus

a week

germinal stage last for

weeks 1 and 2

embryonic stage lasts from weeks

3 to 8

fetal stage lasts weeks

9 to 40/birth

placenta previa

Pregnancy complication when the placenta covers or is near the cervix. causes bleeding

week 3 what system is made

circulatory system and heart begins to beat

how many days post fertilization does the neural tube form

20-24

where did neurons orginate

neural tube cells

weeks 4 to 5 what forms

head followed by ears, nose, eyes (mass to specific sequence)

arms and legs bud (example of proximodistal development)

what happens 3rd month in the fetal stage

SRY gene will lead to male sex organ development

what happens months 4, 5, 6 in fetal development

heart beat strengthens and the digestive and excretory systems develop

from what months does the brain double in size

4 to 7

what months does neurogenesis and synaptogenesis occur

4 to 7

what is ideal amount of time between kids

18 mo

8 symptoms of trimester 1

morning sickness

frequent urination

lightheadedness

headaches

fatigue

missed period

nausea

breast tenderness

percentage of women that have morning sickness not in the morning

80%

when do you begin to feel baby move

apprx. 18 weeks

7 symptoms of trimester 3

fatigue

back aches

insomnia

swelling extremities

heartburn

braxton hicks

sciatic nerve pain

types of teratogens

physical

environmental

drugs

maternal disease

infections

common teratogens

smoking and alcohol

what does smoking do to a baby as a teratogen

hyperactivity, sleep problems, increased risk of SIDS, heart and respiratory problems, stillbirth

what does alcohol do to a baby as a teratogen

Small head, short stature, facial abnormalities, malformed limbs

attention problems, hyperactivity, learning disabilities, memory problems, speech and language delays, low IQ, heart kidney or bone problems

how many chromosomes

23 pairs (46 total)

how often are sex chromosome disorders

1 in 500

how often is downsyndrome

1 in 700