Red blood cells (erythrocytes), are red in color because they contain hemoglobin. The heme component of hemoglobin contains iron, thus giving it a red color.
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A scab turns dark primarily due to the oxidation of hemoglobin in the blood that has pooled in the dried wound. As the blood dries and exposure to air occurs, the red blood cells break down, leading to the formation of dark pigments. Additionally, the presence of proteins and other substances in the dried blood can contribute to the scab's dark appearance. This process is a natural part of healing as the body works to protect the wound underneath.
This process typically occurs in the delicate under-eye area, where the skin is thin and more transparent, making blood vessels and dark circles more visible. The enzyme activity involved in breaking down red blood cells can lead to the accumulation of pigmented by-products, contributing to the appearance of dark circles under the eyes.
It loses oxygen!
Assuming jod is a typo of job... Stippling refers to the dotted appearance of red blood cells when placed in certain stains (such as a basic stain). The presence of stippling in red blood cells can be used diagnostically. For example, red stippling in red blood cells stained with eosin hematoxylin can indicate malaria.
The dark green pigment produced from hemoglobin when red blood cells are destroyed is called biliverdin. It is eventually converted into bilirubin, which gives bile its yellow color.
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Blood appears dark red or black when it dries due to the oxidation of hemoglobin, the protein in red blood cells that carries oxygen. When blood is exposed to air, it loses moisture and the iron in hemoglobin undergoes a chemical change, causing the color to shift. Additionally, the presence of other components in blood, like cells and plasma, can contribute to the darker appearance as it coagulates and dries. The visual change is a natural result of the drying and oxidation processes.
Light is needed in order to perceive visual information because it stimulates the light-sensitive cells in your eyes (rods and cones). These cells then convert the light into electrical signals that are sent to the brain for processing. Without light, these cells are not stimulated and you are unable to see.
They are carrying carbon dioxide and are from the venous part of the circularity system.
Well im guessing it makes your blood-alcohol content rise, but that's just a shot in the dark.
White blood cells may appear dark on a computer screen due to the way they are visualized under a microscope, often using staining techniques that enhance contrast. Stains like Wright's or Giemsa can highlight cellular components, making them more visible against a lighter background. Additionally, digital image processing may adjust brightness and contrast, resulting in a darker appearance for better visibility and differentiation from surrounding cells.