WHY ? is our attack to answerall the questions every little kid ask . Do you have a dubiousness ? beam it towhy@mentalfloss.com .
Your skin protect you by keep germs out of your body . But when something hard or sharp breaks through your skin , it makes a cutting , or a wound . You start to shed blood because hide and blood vessels are cut heart-to-heart . Your torso work fast to shut down up the injury so germs ca n’t get inside and make you macabre . But sometimes the combat injury itch as it heal .
When you get a slash , special blood cells call platelets start stick together around the hatchway of the wound . This is called a clot , and it stops the bleeding . As a clot dries , it turns into a blackleg . The blackleg help to keep germs out . The pelt around the injury may get pinkish and swollen . That ’s because your body is fixing broken blood vessels and growing new tissue . That ’s when you might commence to feel itchy .
Your body loose a chemic calledhistamine(HISS - tuh - meen ) that help your cells struggle contagion , end the wound , and take it in with new tissue . But histamine causes a kind of sensitized chemical reaction that can make you itch . Your skin also has especial nerves that get roiled when skin and tissue grow and stretch to fill in a wound . Those pissed nerves direct a sign to your head that you have an urge , and that makes you need to scratch up it . But do n’t scratch ! You could scratch the right way through the rat and cause your wound to bleed . Then the healing would have to start out all over again !
To see more about how wounds cure , check out thisawesome animationat The Kid Should See This . Some of the words will be new to you , so watch it with a grown - up !
