The occurrence of short tracheids in close proximity to the veins is a characteristic of coniferous leaves; these elements assume two distinct forms - (I) the short isodiametric tracheids (transfusion-tracheids) closely associated with the veins; (2) longer tracheids extending across the mesophyll at right angles to the veins, and no doubt functioning as representatives of lateral veins.
Regarding disorders and disabilities: We should be able to repair, heal, or replace any part of the body not functioning at the level the person with the disability reasonably wishes it to.
In a few cases some of the tracheids have very thick walls and reduced cavities, functioning as mechanical rather than as waterconducting elements.
I remember in autumn of '87 thinking it was perfectly reasonable to take the red 1964 Corvair convertible for a test drive, despite its lack of functioning brakes.
Yet his conception of this faculty as functioning only in and through motive and character, inclination and desire, certainly carries us a long way beyond the abstraction in which his opponents stuck, that of a bare faculty without any assignable content.
The whole functioning of our mental apparatus is directed upon yielding the right response to the stimulations of the environment, and is valuable if and in so far as it does this.
She went to the workstation monitoring the underground systems and saw with relief that the underground lair was functioning as normal.
The embryo passes through three stages - (I) still enclosed within the egg and living on its own yolk; (2) free, within the vitelline mass, which is directly swallowed by the mouth; (3) there is no more vitelline mass, but the embryo is possessed of long external gills, which serve for an exchange of nutritive fluid through the maternal uterus, these gills functioning in the same way as the chorionic villi of the mammalian egg.