Conception And Stages Of Conception Flashcards
What is conception?
Fertilization when the sperm cell meets the egg cell creating a zygote
What is gestation?
Period of conception to birth
How is gestational age measured?
Age from first day of last menstrual cycle and in weeks
Lasts around 38-42 days
What is in a zygote?
All the DNA to form a human being
What is a blastocyst?
Inner cells become the embryo
Outer shell is formed to protect and nourish
Reaches the womb (day 5)
What does the blastocyst implant to?
The uterine wall where it receives nourishment from the mother’s blood stream
How does the embryo develop?
3-8 weeks
First trimester
Cells continue to divide
What differentiation takes place in the embryo stage?
Cells begin to take specific functions
All major organs form
What is the greatest risk in the embryo stage?
Forming birth defects and miscarriage
How long does the fetus stage last?
9-42 weeks
End of first trimester to the end of the third trimester
What happens during the fetus stage?
Major structures are formed
Organs mature
What is viability?
When a fetus can be born and live outside of the mother’s womb
At 20-26 weeks
What is a trimester?
A 3 month period
Conception of 9 months
What is trimester 1s period?
Week 1-12
What is trimester 2s period?
Weeks 13-27
What is trimester 3s period?
Weeks 28-42
What happens during the first trimester?
Rapid growth of embryo
Heart begins beating
All major body parts form
What happens during the 2nd trimester?
Organ systems continue to develop Reproductive organs are visible Facial features form First kicks About 12 inches, a little over a pound
What is important to note about a premature fetus born at the end of the second trimester?
Can survive outside of the womb with medical assistance?
What happens in the 3rd trimester?
Most rapid weight gain
All other organs except the brain are complete
Fat layer under the skin smooths it
About 20 inches, weighs 6-9 pounds
