Wrist blood vessels fortune telling _ blood vessels on people's wrists

There are purple-blue blood vessels on the wrist, which are a little green. What color is that?

It is said that the color of blood vessels is purple, which belongs to cool tone; The color of blood vessels is green, which belongs to warm tone; If the color of blood vessels is both purple and green, it is regarded as an intermediate color.

Blood vessels are the conduits through which organisms transport blood, which can be divided into arteries, veins and veins according to the transport direction. Capillary tube Arteries bring blood from the heart to the body tissues, veins bring blood from the tissues back to the heart, and capillaries connect arteries and veins, which are the main places for material exchange between blood and tissues.

All living things have different types of blood vessels. Open-circulating organisms, such as insects, have only arteries. Blood automatically flows out of the pulse, directly contacts the body tissue, and then recovers blood from the opening in the heart.

Closed-loop organisms, such as mammals, birds,? Reptiles and fish connect to capillaries through arteries, then to veins and finally back to the heart.