Flashcards in Part 6 Deck (62)
At birth, there is increased blood flow through the?
Lungs and Liver
At birth, pulmonary vascular resistance?
At birth there is loss of blood flow through the?
Loss of blood flow through the placenta doubles the?
Systemic Vascular Resistance
At birth, there is closure of?
Closure of foramen ovale is due to reversal of pressure gradient between?
R and L atrium
Reversal of flow from aorta to pulmonary artery, and increased oxygen levels cause constriction of smooth muscle causes closure of?
It's unknown why ductus venosus closes, but it allows portal blood to?
Perfuse Liver Sinuses
In fetal circulation, the R and L ventricle pump in parallel into the?
In fetal circulation there is very little?
Pulmonary Blood Flow
In fetal circulation there is low pressure in the aorta due to low TPR because of?
In fetal circulation, blood returning from the placenta via the umbilical veins bypass liver and flow directly into?
IVC via Ductus Venosus
In a fetus there exists 2 right to left shunts for blood to bypass?
Foramen ovale shunts most blood returning to the heart from the?
IVC to the L atrium
Ductus Arteriosis shunts most blood returning to the heart from the?
SVC to the Aorta
What's the greatest stress on the cardiovascular system?
Sympathetic nervous system orchestrates many of the changes associated with?
With exercise what in increase 5-6 fold?
During exercise, blood flow is shifted primarily from organs to?
Active skeletal muscle
During exercise there is cerebral cortical activation of the?
Sympathetic Nervous System
The SNS will cause vasoconstriction of arterioles to decrease?
Flow to non active tissues (viscera)
The SNS will cause vasoconstriction of veins to increase MCFP which increases?
The SNS will stimulate the heart by increasing HR and SV which ultimately increases?
During exercise TPR decreases due to?
Vasodilation in active muscle
During exercise increase O2 uptake decreases VO2 which increases?
SNS stimulation is due to?
Cerebral Cortex Stimulation
Reflex signals from active joint proprioceptors and muscles as well as local chemoreceptor signals originating in the active muscle will stimulate?
SNS will induce local metabolic vasodilation at the?
SNS stimulation of pre-capillary resistance vessels decreases?