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White blood cell
White blood cells (also called leukocytes or immune cells) are cells which form a component of the blood. They help to defend the body against infectious disease and foreign materials as part of the immune system. There are normally between 4x109 and 11x109 white blood cells in a litre of healthy adult blood - about 7,000 to 25,000 white blood cells per drop. In conditions such as leukaemia this may rise to as many as 50,000 white blood cells in a single drop of blood. As well as in the blood, white cells are also found in large numbers in the lymphatic system, the spleen, and in other body tissues.
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April 3, 2026
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Apr. 2, 2026 A surprising new study suggests that genetics may change how diet affects brain health—especially when it comes to Alzheimer’s risk. Researchers found that older adults carrying high-risk APOE gene variants didn’t show the expected cognitive ...
Apr. 2, 2026 Scientists have taken a major step toward protecting the very cells that make sharp, colorful vision possible. By testing more than 2,700 compounds in thousands of lab-grown human retinal models, ...
Apr. 2, 2026 Hara hachi bu, a traditional Japanese practice of eating until you’re about 80% full, is gaining attention as a simple yet powerful way to improve health and reshape our relationship with food. ...
Apr. 2, 2026 A deadly parasite responsible for sleeping sickness has been found using a surprisingly precise trick to stay hidden in the human bloodstream. Scientists discovered a protein called ESB2 that acts ...
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