Physiology: Venous Return and Cardiac Output

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Which physiological variable reflects the degree of distension of the circulation with blood?

Mean systemic filling pressure (MSFP) (correct)

Venous resistance

Right atrial pressure

Cardiac output

What is the volume of blood that flows back to the heart per minute known as?

Venous resistance

Cardiac output (correct)

Arterial return

Venous pressure

What determines the interaction between mean systemic filling pressure (MSFP), right atrial pressure (RAP), and resistance to venous return (RVR)?

The venous return curve

Cardiac output

Pressure gradient for venous return (correct)

The pressure gradient for arterial return

What is the pressure that drives the venous return?

Mean systemic filling pressure (MSFP) Signup and view all the answers

What happens to venous return if the right atrial pressure is high?

Decreases Signup and view all the answers

What is the equation for venous return according to Ohm's law as provided in the text?

Venous Return (VR) = 𝐌𝐒𝐅𝐏 + 𝐑𝐀𝐏 ‒ 𝐑𝐕𝐑 Signup and view all the answers

Which of the following is NOT a physiological variable that determines venous return?

Left atrial pressure Signup and view all the answers

What does the resistance to venous return (RVR) represent?

The vascular resistance to venous blood flow back to the heart Signup and view all the answers

What happens to the flow of venous blood back to the heart if the mean systemic filling pressure is increased?

It increases Signup and view all the answers

Under normal conditions, what is the relationship between venous return and cardiac output?

Venous return is equal to cardiac output Signup and view all the answers

What is the effect of increased resistance to venous return on the flow of venous blood back to the heart?

It decreases the flow Signup and view all the answers

What is the purpose of the venous return curve?

To study the interaction between MSFP, RAP, and RVR Signup and view all the answers

What is the result of a high right atrial pressure on the flow of venous blood back to the heart?

It decreases the flow Signup and view all the answers

What is the relationship between the pressure gradient for venous return and the flow of venous blood back to the heart?

The pressure gradient drives the flow Signup and view all the answers

What is the net effect of an increase in mean systemic filling pressure and a decrease in right atrial pressure on the flow of venous blood back to the heart?

It increases the flow Signup and view all the answers

What is the role of Ohm's law in the regulation of venous return?

It describes the relationship between pressure gradient and flow Signup and view all the answers

Physiology: Venous Return and Cardiac Output

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