gestation Flashcards
definition of gestation
the time in which a foetus develops,beginning with fertilisation and ending with birth.Another name for this pregnancy
what happens on the first week of gestation
zygote divides to form a ball of cells called an embryo and floats down from the fallopian tube
name at least 2 things that happen on week 3-5
-embryo’s tiny heart beats by day 21
-facial features begin to form
-placenta provides nourishment
-spinal cord grows faster than rest of body
name at least 2 things that happen on week 7
-major organs begin to form
-gets unique blood from mother
-hair follicles and muscles grow and begin to move
name at least 2 things that happen on week 8-12
-hands and feet are seen
-embryonic stage ends
-develops into foetus
name at least 2 things that happen on week 13-16
-brain fully developed
-able to make irregular breathing sounds
-able to feel pain
-skin is almost transparent
-eyebrows and eyelashes grow
name at least 2 things that happen on week 20-24
-hands,footprints and fingerprints form
-practices breathing through inhaling amniotic fluid into developed lungs
name at least 2 things that happen on week 25-28
-rapid brain development
-nervous system controls bodily functions
-60% chance of survival
-eyelids open and close
name at least 2 things that happen on week 29-32
-rapid increase in fat
-lungs not mature yet
-sleeps 90-95% of days
-if born, chance of survival is 95% and above
how do identical twins occur
identical twins occur when a fertilised egg divides and forms 2 cells.They have to same nuclei-so the same genes
how do non-identical twins occur
non-identical twins occur when the mother releases 2 eggs (instead of 1) from the ovary.They are fertilised by 2 different sperm.
what substances are passed through via the placenta and name at least 2
-oxygen
-nutrients like glucose
-waste products like carbon dioxide
-harmful substances
function of amniotic fluid
to protect baby from bumps and shocks
name at least 2 factors that help the foetus
-folic acid-vitamin B12
-regular but moderate exercise by mother
-healthy,balanced diet
-fish oils
name at least 2 factors that harm the foetus
-alcohol
-nicotine
-carbon monoxide
-drugs like heroin
what happens if there is no placenta
the foetus would die as it isn’t able to get essential nutrients and oxygen needed for survival
name at least 2 benefits of not smoking
-reduce risk of stillbirth
-makes birth easier-
-prevents premature birth
-less likely to be born underweight
-reduce risk of cot death
-reduce risk of asthma and other serious illnesses
name at least 2 effects of alcohol
-increases risk of premature birth; low birth rate
-affects how foetus grows
-can give baby learning difficulties and behavioural problems
-can give your foetus Foetal Alcohol Syndrome
what does Foetal Alcohol Syndrome result in
-restricted growth
-facial abnormalities
-learning and behavioural disorders
name at least 2 effects of illegal drugs
-reduce amount of oxygen that reaches foetus
-can effect foetus development early in pregnancy
-slows or deforms growth
-damages placenta and how well it works
-some of placenta can break off of uterus causing severe bleeding-life threatening to mother and baby
-withdrawal symptoms
