How does the human body differentiate between abrasions and cuts or stretch marks? And if the body sees them similarly, why do they heal differently?
In: Biology
Cutting is cutting, abrasions are abrasions and stretchmark are from stretching.
Every one of them is caused by something else. A cut is the skin being damaged by something sharp sliding on the skin and causing damage. Abrasions are from rubbing against something (for exampld the skin of your hands on the sidewalk when you fall). It’s caused by friction. And stretch marks are from stretching the skin relatively slowly (gaining weight, growing up. Stretching fast enough so the skin can’t keep up with regenerating, but slow enough so the skin doesn’t break. Well, imagine the scenes from all the movies where there is some kind of alien/monster growing inside a human really fast. The skin becames thinnier (like a stretchmark) but at some point the alien grows too fast (or tries to escape the body – stretches his arms and legs so he takes more space) so the skin has to stretch really really fast and breaks.
Human skin is pretty elastic so it doesn’t break that easily and we are able to have stretchmarks.
Human body “sees” these damages differently. Cutting parts pieces of skin, abrasions are like layers of skin being rubbed of, and stretchmarks are healing fast enough so you don’t really notice getting them and healing. Mostly.
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