embolism

Question 1

prenatal development stages
first stage

Answer 1

the germinal period

first 14 days post fertilisation

egg cells divide after 18-39hours after fertilisation

first 6-7 days in the fallopian tube

moves into uterus by ciliated cell lining

if pelvic inflammation disease from STD (eg chlamydia) then risk of ectopic pregnancy

Question 2

prenatal development stages

second stage

Answer 2

blastocyst formation

day 6 =

trophoblast into placenta
inner cell mass into embryo

Question 3

prenatal development stages

last stage

Answer 3

implantation

day 7 = blastocyst arrive in uterus

Question 4

What is terotogens

Answer 4

any environmental factor which can interfere with prenatal development and leads to birth defects

Question 5

examples of terotogens

Answer 5

ionising radiations

noxious chemicals

certain drugs

certain infectious disease (rubella)

Question 6

exposure to terotogens at what stage of prenatal development is most dangerous

Answer 6

exposure to terotogens during embroyonic stage is harmful as major organs are forming at this time

Question 7

terotogens example of conditions

C

Answer 7

CMV - sexually trasmitted
can be aysmptomatic
1% of pregnant women
symptoms in babies can be:
hearing loss
learning disabilities
cerebral palsy
visual defects

Question 8

terotogens example of conditions

A

Answer 8

FAS - foetal alcohol syndrome

s&s in babies:
CNS problems
small head
flat facial profile
thin upper lip
failure to thrive, behaviour problems

Question 9

terotogens example of conditions

T

Answer 9

Thalidomide drug

used in 1960’s to treat morning sickness
interferes with limbs - shortens legs and arms
shown to npw inhibit growth of blood vessels
now used in cancer treatments