i Register
In some senses, physiology is marked as obsolete. Watch for register when choosing this word.
noun
A branch of biology that deals with the functions and activities of life or of living matter (as organs, tissues, or cells) and of the physical and chemical phenomena involved.
So he clung to the sides of the vertical tunnel, le wormhole, employing the setules covering his legs, that is, millions of tiny spider-hairs with triangular tips, a wall-creeper physiology if you wish, a hang-upside-down-from-the-ceiling anatomical boon.
The biology and/or form of a living organism.
The study and description of natural objects; natural science.