Fetal development

Question 1

How long is Gestation (fetal development)

Answer 1

9 months or 40 weeks

Question 2

First trimester

Answer 2

By the end, 93 days, all major organ systems have started to develop

Question 3

Cleavage

Answer 3

First cellular divisions

Question 4

Day 4

Answer 4

Implantation into uterus

Question 5

Day 6

Answer 5

Blastocyst
Mass of cells become embryo
Release hCG

Question 6

hCG

Answer 6

Maintains levels of progesterone so menses does not occur

Question 7

Week 4

Answer 7

Plancentation
Umbilical cord connects baby to placenta
Placenta supplies nutrients respiration excretion n and hormones to baby
Within placenta the moms and baby’s blood never mix
Placenta takes over progesterone production and hCG stops

Question 8

If if placenta does not take over progesterone production

Answer 8

Then hCG stops and menses occurs causing miscarriage

Question 9

Second trimester

Answer 9

Organ and organ systems continue to develop to near completion
Body looks distinctly human

Question 10

Third trimester

Answer 10

Rapid fetal growth is characteristic of this phase
Most of the organ systems are fully functional even with 2 months to go

Question 11

21- 30 weeks (3rd tri)

Answer 11

Substantial increase of weight
May survive if born prematurely at 27-28 weeks but hypothalamic temp regulation and lung production of surfactant are still inadequate, ( can’t inhale and exhale air without lungs collapsing)