What is the running speed of human blood under normal circumstances?

According to what you said. Under normal circumstances, the resting blood flow velocity of aorta is 18 ~ 22 cm/s, vena cava is 7 ~ 8 cm/s, and capillary is 0.3 ~ 0.7 mm/s, which is only a rough figure. There are fluctuations up and down. And age and physical condition will also have a certain impact. I hope my advice can help you. Human blood starts from the heart, passes through various arteries and capillary networks, and then returns to the heart from various veins. The whole process only takes 20-30 seconds. The blood circulation in human body is divided into systemic circulation and pulmonary circulation. Systemic circulation is a process in which the heart pumps arterial blood and supplies oxygen to various tissues and organs. Pulmonary circulation refers to the process that venous blood in the heart passes through pulmonary circulation, refills these venous blood with oxygen and converts it into arterial blood. Systemic circulation and pulmonary circulation ensure sufficient oxygen in human blood, ensure that all tissues and organs can get sufficient oxygen supply and maintain normal physiological functions. Because the pump pressure of the heart is high and the blood flows quickly in the human body, the blood circulation time is very short.