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Exam 2- cardio & babiessss
Terms in this set (15)
What is a portal system?
blood flowing from the capillary bed of one structure via a large vein to the capillary bed of another structure.
What are the 4 types of portal systems present in the body?
Hepatic portal ( blood from hepatic portal vein to hepatic vein)
Hypophyseal portal (blood from hypothalamus to anterior pituitary)
Renal portal (blood flow from renal portal vein to renal vein)
Umbilical (blood flow from umbilical vein to portal vein)
What is a placenta?
Organ that develops and implants in the mother's womb (uterus) during pregnancy.
What connects unborn baby to placenta?
How does mother supply nutrients to the baby?
Mother's blood goes through the placenta and to the baby through blood vessels in the umbilical cord
Where do waste products and carbon dioxides from baby get sent to?
Send through umbilical cord blood vessels -> placenta -> back to mother's circulation
What are the 3 shunts used in fetal circulatory system to bypass certain body parts (lungs & liver)?
Function of foramen ovale
Moves blood from right atrium of heart to left atrium. Most of blood goes through here
Function of ductus arteriosus
Moves blood from pulmonary artery to aorta
Function of ductus venosus
Moves blood through the liver to the inferior vena cava
Blood flow through fetal heart
Nutrients from mother -> placenta -> umbilical cord -> baby's liver -> ductus venosus shunt -> IVC -> right atrium -> across foramen ovale -> left ventricle -> ascending aorta -> systemic circulation (to brain,heart muscle, lower and upper body, etc)
Deoxygenated blood comes back to right atrium -> right ventricle ->ductus arteriosus shunt-> descending aorta -> umbilical arteries -> placenta -> mother's circulatory system
What happens at birth?
1. Prostaglandins levels drop
2. Baby breaths; lowers pressure in pulmonary circuit
3. Umbilical cord is clamped and cut, which increase systemic pressure
4. Closing of several things ( foramen ovale, ductus arteriosus, ductus venosus)
What does the foramen ovale become after birth?
What does ductus ateriosus become after birth?
Ligamentum arteriosum (o2 rich content signals for original ductus arteriosus to close)
What does ductus venosus become after birth?
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