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There really isn't a cause, it's just the lack of melanin or the thickness or your skin at that point. If you are really pale you have a higher chance of blue veins showing. On areas like your hands you can see veins because your skin is thinner there. On areas like your lower legs, the veins are larger and are therefore more visible.
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Why is the color of blood is always red in color?
Blood is always red (NEVER blue) because of hemoglobin, the main factor in blood's color. Deoxygenated hemoglobin is dark red, while oxygen enriched hemoglobin is more cherry red. The common misconception that deoxygenated blood in your veins is blue stems from textbooks that show arteries in red and veins in blue for simplicity. Also, your veins appear blue through your skin because of a variety of reasons only weakly dependent on the color of the blood. Light scattering in the skin, and the visual processing of color play roles as well. If arteries were near the skin surface, they would appear blue as well. Cameras inserted in veins during medical procedures clearly show that blood in veins is red, and when drawing blood from veins in a way that doesn't expose it to the air, it is clearly a dark red color and not blue.
Why does your veins show more during pregnancies?
because you have more blood going through you and its pumping faster to get to baby.
How do you use infinitesimal in a sentence?
An infinitesimal amount of people went to the show.
What is the difference between blue and red capillaries?
They are not really red and blue. This is seen in preserved animals (and cadavers) and in drawings to show which are higher in oxygen (red) and lower (blue). In general, you also can see than veins are shown in blue and arteries are red.
What is a normal result for a phlebography test?
Normal phlebography results show proper blood flow through the leg veins.
Do the veins in your breasts start to show more before your period?
It is highly possible that your veins will show. Before your period, hormones cause your breasts to swell which can lead to more pronounced veins.
Why does the skin turn blue when there is inadequate blood flow?
Blood that is low is oxygen is slightly bluish and so it tints the skin the same. People often say that blood without oxygen is blue but that isn't true. Pictures in textbooks show arteries as red and veins as blue but that is just to show you exactly the way they run and where they are.
Why do anorexics vans show?
In anorexics, there is little or no fat to cushion and "round out" the skin or muscle on the bodies, so often bones and veins will begin to show through the thin layers of skin.
What color is de oxygenated blood?
No. De-oxygenated blood is a dark red color. It may look blue in an anatomy and physiology text book, but the authors do that to show more clearly which blood vessels, usually veins, that carry de-oxygenated blood. That is why they color them blue. And then the arteries, which usually carry oxygenated blood, are colored red. In real life, your veins look blue because of the other tissues that have pigments in them that you have to look through to see your veins. Even though they appear on the outside to be blue, in fact, on the inside they are carrying deep dark red blood. Just look at the vial of blood the next time the nurse draws some for a test. You will see that it is dark red.
Is it true that when a horse is pregnant their veins show?
As the girth of the mare expands some veins become more obvious.
Why are your arm veins so visible?
Because skinny people have less or no fat on them which causes more veins to show throuought their body......really depends on the person tho i have veins on bith sides of my head and im very skinny as well
How part of the theory of circulation was changed?
People used to think that blood could flow in any direction in the veins. William Harvey came up with evidence used to show that blood moved only in one direction through veins. He discovered that the valves in the veins permit blood to flow in one direction only. He said that blood circulates in only one direction through the body and returns to the heart.
