3. Each letter is positioned at a point (similar points where we’d measure P1 or

Question

3. Each letter is positioned at a point (similar points where we’d measure P1 or P1, to measure ?P) that indicates a blood vessel, either just prior to entering or just leaving a heart chamber:

The following are the Pressures at each point:

A = 2 mmHg      

B = 80 mmHg     

C = 5 mmHg                  

D = 10 mmHg

given:

Cardiac Output = 5 L / min (this is Flow, F )

Flow in the two circuits is matched and recalling that Flow = ?P / R

then calculate (show work for partial credit)

i) Resistance of systemic circuit         ii)Resistance of pulmonary circui

iii) indicate units determined for Resistance

Explanation / Answer

Here we have been provided with four types of pressures. We know than systemic arterial pressure is higher than pulmonary arterial pressure. The pulmonary venous pressure lies in between 2 to 15. Therefore, the values are as following-

Pulmonary venous pressure A=2 mmHg

Pulmonary arterial pressure D =10 mmHg

Systemic arterial pressure B =80 mmHg

Systemic venous pressure C =5 mmHg

Now we need to calculate-

i) Resistance of systemic circuit F= ? P / R

R = ? P /F

R = (80-5 mmHg)/ 5 L/min

R = 15 wood units or

R = 15 x 80 dyn sec/ cm5

R = 1200 dyn sec/ cm5

ii) Resistance of pulmonary circuit R = ? P /F

R = (10-2 mmHg)/ 5 L/min

R = 1.6 wood units or

R = 1.6 x 80 dyn sec/ cm5

R = 128 dyn sec/ cm5

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