It seems to be as applicable to the dilatation of the heart, as to that of an artery.
In these cases the tubular form may rather be due to dilatation than to cohesion.
There may be dilatation of the pupil, but this is not seen in all.
The systole of the heart means its contraction: the diastole of the heart means its dilatation.
By compression or dilatation, they are changed ...