If something is in your skin, it punctured a specific spot, It is keeping it covered, like tape on a pipe that is leaking, locate the hole, and tape it up. The strength keeps it from leaking. Say, a knife enters your skin, it won't bleed much, but when you pull it out, it unclogs the toilet, quote on quote.
Sometimes if you work out to much that it can cause an injury and we don't want that to happen but also at the same time it can be good for you depending on the build you want
Development of the human heart during the first eight weeks (top) and the formation of the heart chambers (bottom). In this figure, the blue and red colors represent blood inflow and outflow (not venous and arterial blood).
