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Though veins might make it appear as such, human blood is never naturally blue. [3] The blue appearance of surface veins is caused mostly by the scattering of blue light away from the outside of venous tissue if the vein is at 0.5 mm deep or more. Veins and arteries appear similar when skin is removed and are seen directly. [4] [5]
Veins close to the surface of the skin appear blue for a variety of reasons. The factors that contribute to this alteration of color perception are related to the light-scattering properties of the skin and the processing of visual input by the visual cortex, rather than the actual colour of the venous blood which is dark red. [6]
Gorgonzola blue cheese takes its name from the village of Gorgonzola in Italy where it was first made. [28] Belonging to the family of Stracchino cheeses, Gorgonzola is a whole milk, white, and "uncooked" cheese. [28] This blue cheese is inoculated with Penicillium glaucum which, during ripening, produces the characteristic of blue-green veins ...
Wheels of gorgonzola cheese ripening Dorset Blue Vinney Shropshire Blue Stichelton at a market. Blue cheese is a general classification of cheeses that have had cultures of the mold Penicillium added so that the final product is spotted or veined throughout with blue, or blue-grey mold and carries a distinct smell, either from that or various specially cultivated bacteria.
A number of blue cheeses are made in a similar way to Blue Stilton. These gain their blue veins and distinct flavour from the use of one or more saprotrophic fungi, such as Penicillium roqueforti and Penicillium glaucum. Since the PDO came into effect, some British supermarkets have stocked a generic "British Blue cheese".
Although both lumens are in the vein, the "arterial" lumen, like natural arteries, carries blood away from the heart, while the "venous" lumen returns blood towards the heart. The arterial lumen (typically red) withdraws blood from the patient and carries it to the dialysis machine, while the venous lumen (typically blue) returns blood to the ...
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Veins close to the surface of the skin appear blue for a variety of reasons. However, the factors that contribute to this alteration of color perception are related to the light-scattering properties of the skin and the processing of visual input by the visual cortex , rather than the actual color of the venous blood.