Blood gets its color from hemoglobin, the protein in your red blood cells that carries oxygen throughout your body. When hemoglobin binds with oxygen, it turns bright red.

All blood in the human body is red in color. It is untrue that deoxygenated blood is blue. Human blood contains hemoglobin, which is a complex protein molecule in red blood cells. Hemoglobin ...

Bright red blood suggests active, recent bleeding that may be more serious than older “coffee-ground” appearance. Associated symptoms often indicate severity.

Red blood cells are about the same size as the capillaries through which they travel, so these cells must move in single-file lines.

“Basal cell carcinoma often has bright red blood vessels within it and can look shiny,” Fahs, who goes by @dermy_doc on Instagram, explained.

Back in the 1980s, when Fowler started working with red blood cells, it wasn’t clear whether they even contained myosin. She suspected they might, because the protein appeared to play a role in giving ...

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Blood in the stool has multiple causes, like hemorrhoids and anal fissures. Learn about how it's diagnosed, treatment, when to see a doctor, and more.

Spotting blood in the toilet after you use the bathroom can be a jarring experience. Though some may be tempted to ignore the issue, experts warn that this symptom deserves a second look. In the U.S., ...

Period blood color variations, such as bright red, brown, or black, are typically normal and reflect changes in menstrual flow. However, unusual color ...

Red blood cells carry oxygen from the lungs to every other organ, and blood-forming stem cells must make about 200 billion new red blood cells each day to keep the oxygen flowing. For many years, ...

Find out what nutrients are in blood oranges and learn how they can help everything from your immune system to digestion.