Unit 2/ Sac 1 Flashcards
Placenta
An organ that through the umbilical cord nourishes the baby.
Morula
Solid ball of 16 cells, created from a zygote.
Teratogen
An agent or factor which causes malformation on the embryo.
Differentiation
When cells take on a specific risk as to what purpose they will have. They distinguish themselves from brain cells to red blood cells to skin cells and so on.
Conception
When the sperm and egg meet in the Fallopian tube and form a zygote.
Embryo
A developing baby during the 2nd to 8th week of pregnancy.
Blastocyst
A cluster of cells in which some cell differentiation has occurred.
Germinal stage
- features
- timing
- risks
Germinal (0-2 weeks)
Starts at fertilisation and ends at implantation (when it reaches the uterus)
Forms from zygote - Morula - Blastocyst.
Risks include genetic material coming together causing malformations and ectopic pregnancy.
3 stages of the birth process
Dialation of the cervix
The birth
The afterbirth
Trimester
There are 3 trimesters, all consisting of 3 months. It’s a section of pregnancy that is defined by development milestones.
How does a foetus get half of its genetic material from each parent?
A zygote contains 23 chromosomes from the sperm and 23 chromosomes from the ova.
Placenta role
The role of the placenta is to allow oxygen and nutrients to the baby from the mother via the umbilical cord and extract carbon dioxide and waste from the baby.
Embryonic stage
(3-8 weeks)
Ends at the cell differentiation stage. Most critical stage because organs develop now, fingers and toes grow.
Risks include possible Spina bifida as well as other organs not developing properly.
Foetal stage
9-38 weeks
Grows to 50cm long, lungs, liver, and digestive system begin to function. Placenta is fully functioning by week 14.
APGAR SCALE
Appearance Pulse Grimace Activity Respiration
Assessment to evaluate newborns condition.
