After a cut, blood seeps from the wound, triggering an immediate repair process. The blood cells take action immediately. They stop the leak, form a plug, and destroy harmful bacteria. A scab forms, and the clot dissolves when the wound has healed.
Injury
A cut in the skin damages blood vessels. Platelets start to group together at the site of the injury.
Plug
The platelets release chemicals that make fibrin, a sticky thread-like protein. Red cells get stuck in the threads, forming a plug. White blood cells arrive to hunt for germs.
Clot
The fibrin threads contract, binding red blood cells and platelets together in a sticky clot, which closes the wound.
Scab
The clot near the skin’s surface dries out to form a protective scab, which covers the healing wound.
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