Question

Respiratory pump for venous return? ​

Answer 1

Explanation:

• Spontaneous breathing has beneficial effects on the circulation, since negative intrathoracic pressure enhances venous return and increases cardiac stroke volume.

• We quantified the contribution of the respiratory pump to preserve stroke volume during hypovolemia in awake, young, healthy subjects.

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Answer 2

Respiratory Activity (Abdominothoracic or Respiratory Pump)

Increasing right atrial pressure impedes venous return, while lowering this pressure facilitates venous return. ... Furthermore, as right atrial pressure falls during inspiration, the pressure gradient for venous return to the right ventricle increases.