. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. force transducer steel plate displacement sensor Figure 2. (a) Schematic longitudinal section ol a segment of an arm of a feather star. Ossicles are movable against each other at a fulcrum, and they are connected with aboral ligaments, oral ligaments, and mus- cles, (b) Pieces of arm were glued to a holder oriented with the aboral side up (as in Fig. 2a). The oral part, including muscles and oral liga- ments, was removed so that the ossicles were only connected via the aboral ligaments. Active flexion occurred in the directi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. force transducer steel plate displacement sensor Figure 2. (a) Schematic longitudinal section ol a segment of an arm of a feather star. Ossicles are movable against each other at a fulcrum, and they are connected with aboral ligaments, oral ligaments, and mus- cles, (b) Pieces of arm were glued to a holder oriented with the aboral side up (as in Fig. 2a). The oral part, including muscles and oral liga- ments, was removed so that the ossicles were only connected via the aboral ligaments. Active flexion occurred in the direction of the arrow and was detected with an eddy current sensor monitoring movements of a stainless steel plate (weight about 110 mg in seawater) fixed to the free end of the preparation. In another set of experiments, forces were measured with a force-gauge whose pick-up needle was positioned on the sample. All experiments were done in a trough containing the ex- perimental solutions at 20°C. Contractile connective tissue stayed in the contracted state for hours even when the K+ depolarizing solution was washed out after only 200 seconds. Probably this effect is due to the so-called "connective tissue catch," a phenomenon typical of echinoderm connective tissues 60 - 40 - c <u 820 « "cl a o. 0 10 I 20 30 Time (min) 40 I 50 60. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
