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Fetal circulation by Mind Map: Fetal circulation

1. 50% to the liver

2. Blood then joins inferior vena cava => to the right atrium

2.1. Most of the blood passes to the left atrium via the foramen ovale

2.1.1. Foramen ovale closes separating right atrium from the left

3. Oxygenated blood taken by umbilical vein to

3.1. Umbilical vessels become ligamentum Teresa

4. 50% to ductus venosus

4.1. Becomes ligamentum venosusum

5. Blood oxygenated in the placenta

6. Neonate circulation

6.1. Baby takes first breath/ placenta ceases to work

6.1.1. Pressure falls in pulmonary venous resistance Blood drawn to lungs Blood back to heart via pulmonary veins

7. New node

8. Immature renal function

8.1. Can prevent dehydration and eliminate lower level metabolic waste products of breast feeding infant

8.2. Low glomerular filtration rate

8.3. Half life of drugs are increased as slow elimination by renal system

9. => left atrium to left ventricle

9.1. => ascending aorta- blood circulates the upper half of the body (brain)

9.1.1. Via the superior vena cave => returns to the right atrium This blood passes to the right ventricle pulmonary artery where a small amount of bloods goes to the lungs

10. New node

10.1. Adaptation of the fetus for extrauterine life

10.1.1. Respiration- the lungs Fetus Lungs are filled with fluid secreted by lungs: this exchanges with amniotic fluid Fetal Breathing Movements are observed from the first trimester becoming more regular with gestation Neonate Factors that stimulate first breath: temperature change, clamping of the cord ^ventilatory drive, compression of vaginal delivery

10.1.2. Temperature regulation In utero- dependant on mother In the neonate Temperature loss after birth due to change in environment Mechanisms for losing heat is not well developed

10.1.3. Liver Immature function Glucose regulation Fuel storage Billirubin

10.1.4. Gastrointestinal system Neonate has immature digestive tract and absorptive capacities Hormone and enzyme production Feeding reflex= can suckle from birth

10.1.5. Kidneys In utero Placenta maintains osmotic pressure In the neonate

10.1.6. Bowel movement Meconuim- mucous, epithelial cells, fatty acids and bile pigments First bowel movement within 24hours. Stool slowly combines with metabolic waste and eliminates all meconium

10.1.7. New node