On how many cells in the body ?
To put things in perspective, a single strand of human hair is around 17 micrometres long. However, if you took all of a child's blood vessels and lay them out in one line, it would be nearly 60,000 miles long. The length of an adult's would be closer to 100,000 miles.
To put things in perspective, a single strand of human hair is around 17 micrometres long. However, if you took all of a child’s blood vessels and lay them out in one line, it would be nearly 60,000 miles long. The length of an adult’s would be closer to 100,000 miles.
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It's about 30 trillion
It’s about 30 trillion
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