The downward slope - Venous return
3 important questions on The downward slope - Venous return
Which factors affect the venous return to the heart?
1. right artial presure
2. systemic filling pressure
3. resistance to venous return
2. systemic filling pressure
3. resistance to venous return
What is the systemic filling pressure?
The pressure in where the blood is evenly distributed around the body- equilibrium, no pressure gradient and so no blood flow. When the arterial pressure= mean systemic pressure: no blood flow (the atria will stop filling when the pressure of the atria = 7mmHg). below this value, the venous return increases until there is a plateau.
Where does resistance to venous return come from?
Mostly the veins. To some extent the arteries.
Venous resistance becomes irrelevant when the atrial pressure= mean systemic filling pressure
Venous resistance becomes irrelevant when the atrial pressure= mean systemic filling pressure
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