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Chocolate-brown blood due to methemoglobinemia. Signs and symptoms of methemoglobinemia (methemoglobin level above 10%) include shortness of breath, cyanosis, mental status changes (~50%), headache, fatigue, exercise intolerance, dizziness, and loss of consciousness.
Blood residue are the wet and dry remnants of blood, as well the discoloration of surfaces on which blood has been shed. In forensic science, blood residue can help investigators identify weapons, reconstruct a criminal action, and link suspects to the crime. [1] Analysis of blood residue is also an important technique in archeology. [2]
It is bluish chocolate-brown in color. In human blood a trace amount of methemoglobin is normally produced spontaneously, but when present in excess the blood becomes abnormally dark bluish brown. The NADH -dependent enzyme methemoglobin reductase ( a type of diaphorase ) is responsible for converting methemoglobin back to hemoglobin .
Blackwater fever is caused by heavy parasitization of red blood cells with Plasmodium falciparum. However, there have been other cases attributed to Plasmodium vivax, [1] Plasmodium malariae, [2] Plasmodium knowlesi. [3] Blackwater fever is a serious complication of malaria, but cerebral malaria has a higher mortality rate.
Sulfhemoglobinemia is a rare condition in which there is excess sulfhemoglobin (SulfHb) in the blood. The pigment is a greenish derivative of hemoglobin which cannot be converted back to normal, functional hemoglobin. It causes cyanosis even at low blood levels.
Arterial blood, which is already oxygenated, is also already a brighter shade of red— this is the blood seen from a pulsating neck, arm, or leg wound, and it does not change colour upon exposure to air. [4] The colour "blood red", therefore, covers both these states: the darker deoxygenated colour and the brighter oxygenated one.
If a peace lily’s leaves turn brown, it may be getting too much sun. The brown could be sun scald. ... Prolific blood donor who saved 2.4 million babies dies at 88. Sports. Sports.
A bruise, also known as a contusion, is a type of hematoma of tissue, [3] the most common cause being capillaries damaged by trauma, causing localized bleeding that extravasates into the surrounding interstitial tissues.