SS2. Cardio vascular system - Pressure, flow + resistance Flashcards
1
Q
What is the average pressure (mmHg) in the aorta?
A
95 mmHg
2
Q
What is the average pressure (mmHg) in the arms?
A
80 mmHg
3
Q
How is the total body resistance calculated?
A
DeltaP (blood flow, volume/time in min) = Q (stroke volume x heartrate) x R (resustance 1/radius^4).
4
Q
What can be canelled out if you know the volume per heartbeat, and heartbeat per minute?
A
The beat can be cancelled out.70 kg, stroke volume = 70 and heartrate of 70:
70 ml/beat x 70 beats/min = 4900 ml/min
so Q = 5 l/min
5
Q
What is the mean arterial pressure with a bp of 120/80?
A
mean arterial pressure:
1/3 x(120) x 2/3 x(80) = 95
6
Q
How is the mean arterial pressure calculated?
A
1/3 x (systolic nr) x 2/3 x(diastolic nr)
7
Q
How can deltaP be calculated?
A
Mean arterial pressure - mean venus pressure
