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What is A standing person lies down. Which of the following occurs? and explain in detail?
Ans. b. Immediately increase in venous return to heart (Ref: Ganong23/e p515)Factors 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