Simplified Model for Cardiovascular System and Its Regulation / 日本温泉気候物理医学会雑誌

 By using a simplified model for cardiovascular system which consists of the cardiac resistance <i>R</i>_h, the artery <i>C</i>_a, the vein <i>C</i>_b and the peripheral vessel <i>R</i>_s, the ratio of the arteriovenous pressure difference Δ<i>p</i> to the maximum arteriovenous pressure difference Δ<i>p</i>_M was defined as the circulatory ratio θ ≡Δ<i>p</i> ⁄ Δ<i>p</i>_M. It was shown that the circulatory ratio θ was θ=1 ⁄ 2 regardless of the exercise. It was revealed that this regulation is done by keeping <i>R</i>_h ⁄ <i>R</i>_s constant and the ratio is equal to the arterial compliance fraction <i>k</i>_a.