TY - JOUR T1 - HY POXIA AND I TS INFLUEN CES ON THE CARDIOVASCULAR AND RESPIRATORY SYSTEMS OF SPONTANEOUSLY BREATHING CATS TT - JF - MJIRI JO - MJIRI VL - 8 IS - 1 UR - http://mjiri.iums.ac.ir/article-1-1403-en.html Y1 - 1994 SP - 43 EP - 46 KW - hypocapnia; arterial chemoreceptors; cardiovascular system. N2 - Effects of acute systemic hypoxia on the cardiovascular system (CYS) and respiration of spontaneously breathing cats were studied in two conditions. 1): Hypoxic air (6-8% 02 in N2) was given to the animal to induce systemic hypoxia for 20 minutes. Hyperventilation at this condition lowered arterial C02 tension (PaC02 hypocapnia). 2): In the second run, induction of hypocapnia was prevented by adding 3-5% C02 to hypoxic air. Comparison of the results of this study indicated that hypoxia, independent of the presence of hypocapnia, caused a significant increase in respiratory rate, aortic flow and arterial blood pressure. However, in the presence of hypocapnia, the increased respiratory rate was 10% less and a general arterial vasconstriction was observed. M3 ER -