細さい動どう脈みゃく

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Meanings

1

noun

arteriole

Medical term for a small branch of an artery leading into capillaries.

dainty, get thin, taper

動move, motion, change

脈vein, pulse, hope

動どう脈みゃく
動脈 is a general artery, while 細動脈 specifically refers to the smaller arterioles.
毛もう細さい血けっ管かん
毛細血管 are capillaries, the smallest blood vessels; 細動脈 are the slightly larger vessels that feed into them.

Compound of 細 (small, fine) and 動脈 (artery), directly describing a small artery.