(b) IN A CONDUCTING TISSUE THE EXCITATORY EFFECT BEING TRANSMITTED UNDER STRONG AND LONG CONTINUED STIMULATION, INDUCES A POSITIVE CURVATURE.
It will thus be seen that the tropic effect is modified by:
(1) the point of application of stimulus,
(2) the intensity and duration of stimulus,
(3) the conducting power of tissue in the transverse direction,
(4) the relative excitabilities of the proximal and distal sides of the organ.
In the following series of Papers the tropic effects of various forms of stimuli will be studied in detail.
SUMMARY.
In a semi-conducting tissue Direct stimulation induces a diminution of turgor and contraction, Indirect stimulation inducing the opposite effect of increase of turgor and expansion.
Unilateral stimulation thus induces a positive curvature by the joint effects of contraction at the proximal, and expansion at the distal side.