Flashcards in Part 6 Deck (62)
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1
At birth, there is increased blood flow through the?
Lungs and Liver
2
At birth, pulmonary vascular resistance?
Decreases
3
At birth there is loss of blood flow through the?
Placenta
4
Loss of blood flow through the placenta doubles the?
Systemic Vascular Resistance
5
At birth, there is closure of?
Foramen Ovale
Ductus Arteriosis
Ductus Venosus
6
Closure of foramen ovale is due to reversal of pressure gradient between?
R and L atrium
7
Reversal of flow from aorta to pulmonary artery, and increased oxygen levels cause constriction of smooth muscle causes closure of?
Ductus Arteriosis
8
It's unknown why ductus venosus closes, but it allows portal blood to?
Perfuse Liver Sinuses
9
In fetal circulation, the R and L ventricle pump in parallel into the?
Aorta
10
In fetal circulation there is very little?
Pulmonary Blood Flow
11
In fetal circulation there is low pressure in the aorta due to low TPR because of?
Placenta-Umbillical Arteries
12
In fetal circulation, blood returning from the placenta via the umbilical veins bypass liver and flow directly into?
IVC via Ductus Venosus
13
In a fetus there exists 2 right to left shunts for blood to bypass?
Lungs
14
Foramen ovale shunts most blood returning to the heart from the?
IVC to the L atrium
15
Ductus Arteriosis shunts most blood returning to the heart from the?
SVC to the Aorta
16
What's the greatest stress on the cardiovascular system?
Exercise
17
Sympathetic nervous system orchestrates many of the changes associated with?
Exercise
18
With exercise what in increase 5-6 fold?
Cardiac Output
19
During exercise, blood flow is shifted primarily from organs to?
Active skeletal muscle
20
During exercise there is cerebral cortical activation of the?
Sympathetic Nervous System
21
The SNS will cause vasoconstriction of arterioles to decrease?
Flow to non active tissues (viscera)
22
The SNS will cause vasoconstriction of veins to increase MCFP which increases?
Venous Return
23
The SNS will stimulate the heart by increasing HR and SV which ultimately increases?
Cardiac Output
24
During exercise TPR decreases due to?
Vasodilation in active muscle
25
During exercise increase O2 uptake decreases VO2 which increases?
AVO2 Difference
26
SNS stimulation is due to?
Cerebral Cortex Stimulation
27
Reflex signals from active joint proprioceptors and muscles as well as local chemoreceptor signals originating in the active muscle will stimulate?
SNS
28
SNS will induce local metabolic vasodilation at the?
Heart
29
SNS stimulation of pre-capillary resistance vessels decreases?
Blood Flow
30
