the.com/capillary
the body's tiniest road, so narrow blood cells line up single file to pass.
means A capillary is the smallest type of blood vessel, where oxygen and nutrients pass from blood into the body's tissues; more broadly, the word describes any very fine, hair-thin tube or the way liquid creeps through one.
from From Latin capillaris, "of the hair," from capillus, "a hair." The image is exact: these vessels are as fine as a strand of hair, so anatomists borrowed the word for the body's thinnest channels. The same root gives us "capillary action" — the way water climbs up a narrow tube as if drawn by an invisible thirst.
- total length
- yours could circle Earth two and a half times
- wall thickness
- one cell thin, where oxygen quietly defects
- slow lane
- blood crawls slowest here, on purpose
- sheer count
- around ten billion threading through you
- narrow squeeze
- red cells bend to fit the gap