4.1 Cardiovascular: Pressures in the CVS

- Overview of the systemic circulation
- Mean Systemic Pressure (MSP) = 7mmHg
- Pressures in the arterial and venous systems
- Systolic and Diastolic Pressures
- Mean Arterial Pressure (MAP)
- MAP = DP + 1/3(SP - DP) = 95mmHg
- Right Artial Pressure (RAP) = 0mmHg
- Compliance = (change in volume)/(change in pressure)
- Difference in compliance between arteries (high) and veins (low)
- Pressure gradient
- Role of the heart in generating pressure gradient causing blood to flow

[@sonikakapoor96]

THANK YOUUU

[@bobboo2733]

What causes the blood to flow to the right atrium is it the 7mm systemic filling pressure or the 95mmHg Mean arterial pressure. I know text books say its the 7mmHg filling pressure but then what is the purpose of the MAP. This concept has been very confusing for a while now.

[@ChofetzChaimDaily]

I don’t get how the pressure drops at all in the veins! isn’t it all part of the systemic vascular circuit?

[@behnamyarani4206]

what do you mean of saying atmospheric pressure to be 0 mmhg whereas we found in the textbooks that the correct value is 76mmhg

[@Hippomedics]

Atmospheric pressure is, in fact, 101kPa (=760mmHg). It is more useful to us to consider pressures in the human body relative to atmospheric pressure, i.e. setting it to 0mmHg. (Imagine quoting blood pressure as 880/840mmHg each time)

[@phoebe9703]

This was so useful, thank you Dr Mason.