Normal foetal adaptations Flashcards
Foetal circulation:
Blood flows from the placenta and travels to the baby in the _____ vein.
Umbilical vein
Foetal circulation:
What is the shunt which causes blood to bypass the liver and instead connects the umbilical vein with the IVC ?
Ductus venosus shunt
Majority of foetal blood goes from RA –> ??? through which structure
LA
through the foramen ovale
Where is the foramen ovale located?
Between RA and LA
What is the function of foramen ovale?
Allows oxygenated blood to cross straight over to the LA, bypassing the RV and lugs
Which structure connects the main pulmonary artery to the descending part of the aortic arch?
Ductus arteriosus
What is the function of the ductus arteriosus in the foetus?
Allows most of the blood from the RV to bypass the foetus’s fluid filled non-functioning lungs
In a developing baby in utero, there is HIGH/LOW resistance in the lung circulation and HIGH/LOW resistance from the placenta in the systemic circulation?
HIGH resistance in lung circulation
LOW resistance in systemic circulation
In the foetus the lungs are filled with?
Fluid
Where does gas exchange occur in the foetus?
Placenta
At which gestation do babies develop alveoli?
36 weeks
Developments of the RESPIRATORY SYSTEM in the third trimester?
Production of surfactant
- to prevent lung collapse
In the third trimester of pregnancy there is accumulation/depletion of glycogen. Why is this?
Accumulation of glycogen.
So that it can be broken down to glucagon and used as an energy source if needed
In the third trimester of pregnancy there is accumulation/depletion of brown fat. Why is this?
Accumulation of brown fat
Important in maintaining body temperature
Where is the accumulation of brown fat?
Between scapular and around internal organs
Production of which substance during labour stops the synthesis of fluid production in the lungs, preparing the foetus for life in the real world?
Cortisol or cateholamine production
Changes in the newborn
Foetal -> newborn circulation
Decreased pulmonary arterial pressure
Alveolar expansion
It is normal for the baby to be blue in the first few seconds of life. true or false ?
True
Why is crying in a newborn good ?
Helps to activate the lungs for breathing
After birth, what should happen to the foramen ovale?
Should close over
After birth, what should happen to the ductus arteriosus?
Becomes ligament arteriosus
After birth, what should happen to the ductus venosus
Becomes the ligament theres
In the first few hours of life, heat loss occurs via which 4 methods?
Convection
Conduction
Evapouration
Radiation
One way babies try to conserve heat is by shivering. True or false?
False
- babies can’t shiver
