i think it is because of rich supply of deoxygenated blood of the venus return form the portal veins and oxygenated blood from the portal arterioles .
A dark bluish or purplish-red and congested appearance of the vagina and cervical muscosa. This is an indication of pregnancy. Marcy
Because of the high amount of blood that circulates through the liver.
The liver is the main production center of red blood cells. The large amount of blood that must circulate through the liver at all times leads to the dark red color.
The human liver as a color ranging from dark red to brown. Anyway the hepatic tissue is not homogeneous, so there are areas of with yellow or green, which denotes the presence of bile, one of the more important products of liver function.
The liver is often represented by the color deep crimson or dark red, symbolizing its association with blood and metabolism. In various cultural contexts, the liver is sometimes depicted as a whole animal, like a sheep or cow, particularly in culinary traditions where liver dishes are common. Additionally, in art and literature, the liver is frequently associated with themes of vitality and detoxification.
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A normal liver should be a very deep red - similar colour to a kidney.
dark red
A common household item that resembles liver is a piece of beef liver itself, often used in cooking. Additionally, certain types of pâté or liverwurst can have a similar appearance. In terms of non-food items, a large piece of dark red or brown leather might also evoke the look of liver.
What can correct your liver
light red
why do red tailed hawks leave one liver in the body of its food