Blood
Why Is Blood Red?
Blood is red because of iron. But the full story — involving protein folding, oxygen chemistry, and why veins look blue — is far stranger and more beautiful.
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Blood
Why Do Mosquitoes Need Blood?
Only female mosquitoes bite, and they are not hungry. They need blood to make eggs.
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Blood
How Do Blood Clots Form?
Blood clots form through a fast repair system involving platelets, clotting proteins, and fibrin mesh.
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Biology
How Does Blood Clotting Work?
Blood clotting is a cascading chemical relay that turns liquid blood into a tough fibrin mesh, sealing wounds quickly while trying to keep the clot limited to the injured area.
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Blood
Can Your Blood Type Change?
Blood type is usually fixed for life, but rare medical events can change what appears on your red blood cells.
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