If blood pressure doubled and the resistance to blood flow increased by 50%, the amount of blood pumped by the?

If blood pressure doubled and the resistance to blood flow increased by 50%, the amount of blood pumped by the heart would

Increase by 1/3

Why? Blood pressure = amt pumped * resistance to blood flow
Answers:
As you've stated Mean Arterial Pressure (MAP) is the amount of blood pumped (Cardiac Output, CO) multiplied by systemic vascular resistance (SVR), or

MAP = CO x SVR

(Which is an application of Ohm's Law: V = IR)

Hence CO = MAP/SVR

If MAP doubles, and SVR increases by 50%, then...

xCO = 2 MAP / 1.5 SVR

x = 2/1.5
x = 1.33

Therefore CO has increased by a factor of 1.33 or 33% or 1/3.

Hope thats clear! Source(s): You understood the difficult member (how the values are related), well done!

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