The radius of the universe can be determined by combining the Einstein formulas, which determine the degree of gravitational redshift and describe the angle of refraction of a beam of light running along celestial bodies. The relationship between the two equations is made by the ratio of the total angle to the angle of deflection of the beam of light passing by the Earth according to the rules of Euclidean geometry (2π/α). The so-called Darwinian evolutionary distances measured from the color changes of the respiratory pigments of biological creatures (in connection with the phase of their circulation) can be paralleled with this. It is possible to measure these to the radius of the universe determined in this way. During the nearly 4-billion-year uninterrupted process of Darwinian evolution, living organisms presumably adapted to surface gravity during mutations as well as to any other environmental factor. In this way, they can accelerate continuously along the imaginary straight line from the origin of life to the appearance of the human race, i.e., within the short evolutionary distance, due to the attractive effect of gravity. During the free fall from the past to the present, the curvature of space-time may gradually appear in their physiological processes and anatomical structure. Specifically in their circulatory system, the rate of evolution would correspond to the most qualitatively advanced level, i.e., the velocity of human blood circulation. In this way, the evolution accelerating to almost the speed of light is reduced to 5.23 cm/s due to an enormous time dilation (as a proportion of angles; α/2π). With this average human blood flow velocity, together with data from cardiac and circulatory procedures, a toroidal, or even more refined, ‘interlocking figure 8 model’ can be constructed. It reflects the dimensions, flow and pressure conditions of the pulmonary and systemic circulation, as well as the work of the heart.