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What color is shark blood?

From timber wolves to tiger sharks, most vertebrate animals have crimson blood in their veins. This hue is produced by hemoglobin, the protein that helps our blood distribute oxygen.

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" " Blood is red, right? In most cases, yes. But, there are animals out there whose blood comes in different colors, such as the octopus, whose blood appears blue. LOIC VENANCE/Getty Images Red elicits strong reactions. Around the world, it is by far the most commonly-used color in national flags. It can be a major confidence-booster: Researchers have found that wearing red garments makes people feel more attractive. On the flip side, according to one 2013 study, looking at red things might cause us to experience pain more intensely. You win some, you lose some. Maybe red wouldn't provoke our brains so much if it didn't happen to be the color of human blood. In this regard, Homo sapiens is far from unique. From timber wolves to tiger sharks, most vertebrate animals have crimson blood in their veins. This hue is produced by hemoglobin, the protein that helps our blood distribute oxygen. In grade school, you probably learned that blood contains three types of cells. White blood cells — or leukocytes — help us fight off viruses, harmful bacteria and other pathogens. Then we've got platelets, the damage control specialists that allow our blood to clot. Last, but not least, are the red blood cells. Their main purpose in life is to carry oxygen around, though they also bring carbon dioxide to the lungs where the gas can be exhaled. Hemoglobin lets them execute both tasks. A core ingredient in red blood cells, it binds to oxygen and carbon dioxide. Hemoglobin is partly made up of iron atoms, which give this protein — and by extension, our red blood cells — a crimson appearance. Since platelets and white blood cells are vastly outnumbered by reds, human blood itself looks red. But the vital liquid exists on a color spectrum. Natural selection has engineered blue-blooded invertebrates, green-blooded reptiles and fish with transparent fluids in their veins. We'll get to meet some of those curious critters today.

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Does period blood attract sharks?

Menstrual blood in the water could be detected by a shark, just like any urine or other bodily fluids. However, there is no positive evidence that menstruation is a factor in shark bites.

Any bodily fluid released into the water is likely detectable by sharks.

A shark’s sense of smell is powerful – it allows them to find prey from hundreds of yards away. Menstrual blood in the water could be detected by a shark, just like any urine or other bodily fluids. However, there is no positive evidence that menstruation is a factor in shark bites. Additionally, evidence suggests when swimming the water pressure will temporarily stop the flow of menstrual blood decreasing the chances any blood is released into the water. Currently there is a gender ratio of 8 men for every 2 women bitten. Meaning, more than 80% of our recorded shark bites in history happened to men. This reflects a historic pattern of more men engaging in marine aquatic activities, especially those that put humans most at risk (e.g. surfing, diving, long distance swimming, spear fishing, etc.). Sharks do not “prefer” to bite males rather than females; rather men had a greater historical chance of being around sharks. According to recent data, more females are being bitten, attributable to more women gaining equality and engaging in water sports. If someone is attempting to maximize reduction of risks, staying out of the water during menstruation is one step that can be taken. However, many people safely dive while menstruating, and we have continued to see no obvious pattern of increased shark encounters.

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