Physiologic Reserve Flashcards
1
Q
O2 consumption can increase how many times fold?
A
20x time fold (250 to 5000ml/min)
2
Q
CO can increase how many fold?
A
4-6 fold (5.5 to 33 L/min)
3
Q
How to increase delivery of Oxygen via the heart (CO)?
A
1) increase filling - increased strength of contraction - SV
2) increase contractility - SV
3) increased heart rate
4
Q
To assist in venous return (3)
What is the net effect?
A
thoracoabdominal pump
skeletal muscle contraction
venous valves
net effect - increase filling of heart
5
Q
What are the regulators of tissue blood flow?
A
arterioles
6
Q
What is the purpose of physiologic reserve?
A
allows for “normal” function in the face of impairments/damage/injury
7
Q
What are some causes of the loss of physiologic reserve?
A
loss with age, chronic disease, drugs (both good and bad)
