The color of a tissue depends upon the state of filling of the capillaries with blood.
He knew nothing of the vessels which we now speak of as capillaries.
This inevitably causes distension of the capillaries with stretching of the arteries and consequent damage to the walls.
The whole stream, on the other hand, passes through the capillaries of the lungs.
Some of the liquid parts of the blood go out through the sides of the capillaries and become food for the cells of the body.
This it does by passing it through the walls of the capillaries.
They change their shape and are able to crawl through the walls of the capillaries.
And the first of these is the proportion of arterial to venous blood in the capillaries.
While passing through the capillaries of the lungs, the blood gives up some of its impurities in exchange for oxygen from the air.
From the capillaries the blood flows into the veins and back to the heart.
1650s, "of or pertaining to the hair," from Latin capillaris "of hair," from capillus "hair" (of the head); perhaps related to caput "head" (but de Vaan finds this "difficult on the formal side" and "far from compelling, since capillus is a diminutive, and would mean 'little head', which hardly amounts to 'hair'"). Borrowed earlier as capillar (14c.). Meaning "taking place in capillary vessels" is from 1809. Capillary attraction attested from 1813. As a noun, "capillary blood vessel," from 1660s.
capillary cap·il·lary (kāp'ə-lěr'ē)
Of or relating to the capillaries.
Relating to or resembling a hair; fine and slender.
The tiny blood vessels throughout the body that connect arteries and veins. Capillaries form an intricate network around body tissues in order to distribute oxygen and nutrients to the cells and remove waste substances. (See circulatory system.)