An appropriate increase in the proportion of blood flow through the superior vena cava to the total venous return during systemic cardiovascular responses

Systemic presser and depressor reactions induced by catecholamines, angiotensin II, adrenoblockers, antianginal preparations (corinfar, mesotrin, nitroglycerin), hypoxic hypoxia, and hypothermia in normo- and hypertensive animals are accompanied by an appropriate decrease in the proportion of blood flow through the superior vena cava and an increase in that through the inferior vena cava in the total venous return.