Central venous pressure (CVP) is the mean pressure in the vena cava or near the right atrium of heart. CVP is generally expressed in millimeters of mercury i.e mm Hg.
CVP in general is determined by the balance between the output of right ventricles and return from systemic venous thereby making it the pressure arising from largest systemic veins. It represents the pre-load index of left ventricle
Phagocytosis is the ingestion of cells or particles as a defence mechanism when white blood cells (macrophages) engulf foreign matter such as bacteria and viruses or as part of a digestion process in free-living cells such as amoeba.
