THE CITED STUDY by Poulin et al. (10) focuses on modeling dynamic cerebral vascular system responses to abrupt changes in its own environment. For the arterial blood PCO2 in such studies, an external environment is the lung alveolar gas. For the cells of the entire brain arterial and arteriolar system of contractile tubules, it is the PCO2 of the arterial blood itself, within the vascular lumen...

1. The oxygen content of venous and of arterial blood from fifteen essentially normal individuals at rest in bed has been determined. 2. The percentage saturation of the arterial blood has varied between 100 and 94.3. The average is 95.5 per cent. 3. The oxygen consumption has varied between 2.6 and 8.3 volumes per cent. 4. The oxygen content and the percentage saturation of arterial blood take...

background: today, endoscopic evaluation of digestive system is an important diagnostic approach in gastrointestinal diseases. as it is an invasive method, it causes fear and anxiety in patients. the current study was fulfilled to evaluate the effect of music therapy during endoscopy on the anxiety of patients by measuring blood pressure. methods: this is an experimental study of single blind c...

Whole blood oxygen equilibrium curves (O2 ECs), blood buffer lines, and several hematologic properties were determined for adult guinea pigs exposed to 700 ppm methyl isocyanate (MIC) for 15 min. MIC inhalation effected a significant reduction of blood O2 affinity; the half-saturation pressure (P50) at 38 degrees C increased from the control (untreated) level of 22.8 +/- 0.1 mm Hg to values ran...

Previous studies showed that synthetic bradykinin produced in-vitro constriction of the ductus arteriosus of the fetal lamb and guinea pig, constriction of isolated human and lamb umbilical vessels, and pulmonary vasodilatation in the fetal lamb. The present study showed that bradykinin precursor, kininogen, is present in arterial blood of the fetal lamb by 61 days of gestation and that its con...

As part of the American Medical Research Expedition to Everest in 1981, we measured hemoglobin concentration, red cell 2,3-diphosphoglycerate (2,3-DPG), Po2 at which hemoglobin is 50% saturated (P50), and acid-base status in expedition members at various altitudes. All measurements were made in expedition laboratories and, with the exception of samples from the South Col of Mt. Everest (8,050 m...