<prompt> A standing person lies down. Which of the following occurs?Increase in cerebral blood flowImmediately increase in venous return to heartDecreased blood flow to the apex of lungIncrease in heart rate  <response>: Ans. b. Immediately increase in venous return to heart Ref: Ganong23e p515Factors Affecting End Diastolic VolumeFactors Decreasing EDVFactors Increasing EDV Increased intra-pericardial pressureQ as a result of infection of pressure from a tumor:- Limits the extent to which ventricle can fill Decrease in ventricular complianceQ:- Increase in ventricular stiffness produced by Ml, infiltrative disease. Standing decreases venous returnQ Increased total blood volume increases venous returnQ:- Constriction of vein reduces the size of venous reservoir, decreasing venous pooling and thus increasing venous return Increased negative intrathoracic pressureQ:- Increases the pressure gradient along which blood flows to the heart Muscle activityQ: Increases venous return as a result of pumping action 