Why is blood red?

Answer 1

Blood is red because the iron on the hemoglobin makes it appear reddish. Think of something that is rusting, it has that reddish color.

In humans and other hemoglobin-using creatures, oxygenated blood is bright red. This is due to oxygenated iron in the red blood cells. Deoxygenated blood is a darker shade of red, which can be seen during blood donation and when venous blood samples are taken. However, due to an optical effect caused by the way in which light penetrates through the skin, veins typically appear blue in colour. This has led to a common misconception that venous blood is blue before it is exposed to air. Another reason for this misconception is that medical charts always show venous blood as blue in order to distinguish it from arterial blood which is depicted as red on the same chart.

Answer 2

The blood when it is inside the body is blue. It only appears to be red because it hits oxygen once you scrape yourself or start bleeding. So, when the blood is inside the body it is blue because it isn't getting enough oxygen. Do you notice when you hold your breathe for a long period of time, your face will start to turn blue? This is because there is a lack of oxygen in your head and the blood begins to show through your skin as it's original blue color.

Answer 3

It's red because of the red blood cells, which are red because of hemoglobin, which is red because of iron. The blue appearance of blood in veins is an optical illusion.

In medicine, we take blood from veins into vacuum tubes (NO OXYGEN!) all the time and while it is dark red, it's still red.

Google it if you must, but the people who tell you it's blue are mistaken.

Answer 4

Blood isn't just red, look at the back of your hands, the veins are blue because the blood in them is blue.

This beacause of a material in blood cells called hemoglobin. This material changes to red when oxygen is added and changes to blue/purple when oxygen is removed.

Also ever wonder why you never get blood removed and see it blue/purple? This is because when blood leaves the viens its is reacts with the oxygen in the air and turns red again.

Answer 5

So it is easier to spot.

The blood flowing through the arteries, capillaries, and veins of our bodies contains many different materials and cells, each with a different function. Plasma, the liquid portion of the blood, comprises more than half of the blood. Plasma is light yellow in color, and is thicker than water, because it contains many substances, in addition to the actual blood cells. These substances include proteins, antibodies that combat disease, fibrinogen, which helps blood clot, carbohydrates, fats, salts, and others.

Red blood cells, or corpuscles, encased in blood vessels, color the blood. Since there are about 35 trillion of these tiny, round, flat discs circulating in one's body at any one time, their sheer number necessarily lends their red color to the blood.

As the young red blood cell matures, and takes on an adult form in the marrow of the bone, it loses it's nucleus, and it increases its production of hemoglobin. Hemoglobin is the red pigment, or color of blood, and contains iron, combined with protein.

When blood passes through the lungs, oxygen piggybacks on the hemoglobin of the red cells. From there, the red cells carry the oxygen through the arteries and the capillaries to all other cells of the body. Carbon dioxide from the body cells returns to the lungs through the veins in the same manner, by attaching to the hemoglobin.

Red blood cells have a life expectancy of approximately four months, before they are broken up, primarily in the spleen, and are replaced by new red blood cells. New cells are continuously generated to replace the old cells that have past their prime, and have been destroyed to make room for the younger generation..

Answer 6

because of the red blood cells!

Answer 7

due to the presence red heomoglobin pigment in blood

Answer 8

due to the red pigment present in the blood called "haemoglobin" which is also a compound of iron.that's why our parents advices us to eat vegetables which contains iron.
so my suggestion is that to eat beet root. i know you most of the people wont like it. but if you want to live more years you had to eat it.

Answer 9

blood contain haemoglobin it has Fe as central metal atom .the nature of Fe is red so only blood is red.

Answer 10

blood is red because it contains hameoglobin in it