. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 678 Couiparative Annual Physiology siirfac-c (rcticLihitc) results in its imparting its tint to the animal. The fore- ooing meelianism of aetion (eoneentration and disjiersion of pigment) is lefeiied to as plusiological color change. The chromatophores may also in Ihicncc the coloration of an animal through their accumulation or production of pigment or iheir loss or destruction of it. This mechanism of aetion is known as mor|)hological color change. Physiological Color Changes. Chromatophores are of two major t
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 678 Couiparative Annual Physiology siirfac-c (rcticLihitc) results in its imparting its tint to the animal. The fore- ooing meelianism of aetion (eoneentration and disjiersion of pigment) is lefeiied to as plusiological color change. The chromatophores may also in Ihicncc the coloration of an animal through their accumulation or production of pigment or iheir loss or destruction of it. This mechanism of aetion is known as mor|)hological color change. Physiological Color Changes. Chromatophores are of two major types. One t\|ie is seen among the cephalopod molluscs and is a complex organ with a |iigmenl-containing component, the changes in h)rm of which result from the acti\ it\ of numerous radialK-arranged smooth muscle fibers acting sxnchronoLish (fig. 254). The second, more common type, is found in most color changing species. It comprises a single cell or small s\ne\tium, usualK of highly branched outline, and within which pigment distribution is altered b\ streaming Fi4. I hf clinunatophorf with a, piynicnt concentrated and h, piyintMit disjicrsftl. F roin ;' I he chromatophores of the cephalopods are highly organized groups of cells, fiach comprises a central uninucleate cell Filled with pigment and pos sessing a highb elastic cell ;' Radiating out from the central cell in the plane ol the skin are from d to 20 or more uninucleate smooth- muscle libers. All the (ibcrs ol a chromatophore usually contract simultane- ously, stretching out the small, s]iherical, central, pigmented cell into a disc having a diameter (ifteen to twentx times that of the original sphere. The sjiherical hirm is restored by the of the membrane of the central |)igmented cell alter relaxation ol the radiating hbers. A single nerxe Hber is saitl to SLippK each muscle llbcr;'" its terminal arborizations disperse broadly n\v\- the ol
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