. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Muscle and Electric Organs 591 muscle cell as in striated muscle, the muscle cells being innervated as motor units (nictitating membrane, blood vessels, pilomotors),^"- -**- (2) from muscle cell to muscle cell by protoplasmic bridges (visceral muscles),'*^ (3) through the muscle sheet by a nerve plexus/ (4) by diffusion of a mediator (sympathin) from cell to '^'' Evidence for diffusion comes from the dependence of size of response on number of impulses; maximum tension in striated muscle depends on th
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Muscle and Electric Organs 591 muscle cell as in striated muscle, the muscle cells being innervated as motor units (nictitating membrane, blood vessels, pilomotors),^"- -**- (2) from muscle cell to muscle cell by protoplasmic bridges (visceral muscles),'*^ (3) through the muscle sheet by a nerve plexus/ (4) by diffusion of a mediator (sympathin) from cell to '^'' Evidence for diffusion comes from the dependence of size of response on number of impulses; maximum tension in striated muscle depends on the number of functioning motor nerve fibers, whereas in smooth muscle the maximum tension when few fibers are stimulated approaches the maximum which obtains when the whole trunk is stimulated. Similar gradation of response occurs with in- jections of different amounts of ;'' Evidence for the first two hypotheses comes from electrical records. Fig. 222. Action potentials of nictitating membrane of cat: a to d, curves resulting from increasing intensities of stimuli. Eccles and ;^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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