[Regional redistribution of blood during emotional excitation in rats].

Shifts in general circulation (GC) and changes of relative blood volume in 46 vascular areas were studied in unanesthetized rats closed in a small cell for 10 min, 1, 3, 4.5 hrs as well as in rats tied with their backs down for 1 hr. The GC increased in the latter case. Regional redistribution of the blood volume was not related to the position of the body but its intensity was related to the degree of emotional excitation. All the tests reduced the relative blood volume in a number of abdominal organs and in small pelvis; in muscles and bones of limbs, abdomen and pelvis; in skin of the breast and hindlimbs. The percent blood volume increase occurred in the brain, heart, lungs, muscles and bones of the head, neck, and breast. Regional blood redistribution in rats tied to a bar with their backs down for 4 hrs involved a decrease of the relative blood volume in the skin, muscles and bones, in a number or organs of the small pelvis and abdomen, while the volume increased in the liver, heart, and lungs.