Kids require a lot of questions .
mental_flosshas solvent . This week we launched WHY ? , our novel serial for kids and parent . We ’ll tackle all type of questions children have about how the existence works by providing skill - base , kid - friendly content . Our solvent are write with early readers ( ages 4 to 7 ) in mind , but we think they ’re interesting — and educational — for everyone .
Have a question ? mail it to why@mentalfloss.com .
A contusion , orcontusion(con - TOO - zhun ) , is one style your body shows you ’ve been ache . If you slam your leg or arm hard enough , the smallest origin vessels in your body , calledcapillaries , can break away . Blood leaks out of the capillaries and make a puddle in your pelt layers . contusion can look black , empurpled , or sorry at first , and later fade to unripened , yellow , or browned .
Your bloodline vessels have an important problem ; a contusion show that there ’s been a problem get the caper done ! rakehell vessels are part of yourcirculatory(SIR - kyool - uh - tor - ee)system , which moves blood from your heart throughout your physical structure , and then brings it back to your heart again . Capillaries are the smallest origin vessels , arteriesare the swelled , andveinsare in between . They operate together like a highway system , travel pedigree everywhere from your head to your toe .
Blood is fulfil with stuff your body motivation , like oxygen , water , chemical , nutrients , andantibodies , which are the cells that help keep you from get sick . A bruise express where there ’s a break bringing that significant stuff through your soundbox . But guess what : Your body repair it right aside ! When capillaries discontinue and leak blood , they squeeze themselves smaller to stop any more blood from escaping . The descent from the bruise is slowly broken down , ormetabolized . That ’s when your bruise changes color . In about two weeks , the bruise will disappear .
For fun further indication , visit the KidsHealth page onbruises .
