Abstract
By using a simplified model for cardiovascular system which consists of the cardiac resistance Rh, the artery Ca, the vein Cb and the peripheral vessel Rs, the ratio of the arteriovenous pressure difference Δp to the maximum arteriovenous pressure difference ΔpM was defined as the circulatory ratio θ ≡Δp ⁄ ΔpM. 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 Rh ⁄ Rs constant and the ratio is equal to the arterial compliance fraction ka.
