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The human body is a biological machine full of details we simply never stop to think about. Here are 5 real facts about anatomy.
1. A large part of your cells get replaced over the years
Different body tissues have different cell renewal rates — skin and gut cells renew within days or weeks, while others, like neurons, last practically a lifetime.
2. Your gut has its own “nervous system”
The enteric nervous system, located in the gut, contains hundreds of millions of neurons — which is why some scientists informally refer to it as the “second brain.”
3. The heart beats about 100,000 times a day
At rest, a healthy adult heart beats on average between 60 and 100 times per minute — adding up to somewhere between 86,000 and 144,000 beats over a single day.
4. Bones are stronger than many metals, relative to their weight
In terms of strength per unit of weight, human bone can withstand more pressure than some types of steel — a combination of lightness and strength still studied in materials engineering.
5. The human eye can distinguish an impressive number of colors
Estimates suggest the typical human eye can distinguish millions of different shades, thanks to a combination of three types of color-sensitive photoreceptor cells (cones).
Want to better understand this incredible machine?
Netter Atlas of Human Anatomy: Classic Regional Approach — a comprehensive visual guide to human anatomy.
Disclosure: this is our tracked Amazon affiliate link. Informational content, not a substitute for medical advice.
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