. The biology of cilia and flagella. Cilia and ciliary motion; Flagella (Microbiology). 188 CO-ORDINATION OF BEAT The higher the viscosity, the faster the co-ordination, apparently because the viscous interaction is increased. Since the amplitude of beat is progressively decreased with increase of viscosity, a point is eventually reached where the viscous interaction is no longer effective and the co-ordination breaks down. It seems probable that this explanation is the correct one, for slight fluctuations of the frequency occur from time to time, and, while slight decreases of frequency in th
. The biology of cilia and flagella. Cilia and ciliary motion; Flagella (Microbiology). 188 CO-ORDINATION OF BEAT The higher the viscosity, the faster the co-ordination, apparently because the viscous interaction is increased. Since the amplitude of beat is progressively decreased with increase of viscosity, a point is eventually reached where the viscous interaction is no longer effective and the co-ordination breaks down. It seems probable that this explanation is the correct one, for slight fluctuations of the frequency occur from time to time, and, while slight decreases of frequency in the normal medium are accom- panied by small ^ increases in wavelength ( wave velocity Cilium Ciliutn bate. Fig. 50. A diagrammatic representation of the theory of metachronal co-ordination proposed in the text. The spon- taneous build-up of excitation in the pacemaker cilium determines the frequency of beat of that cilium, and other cilia beat at constant intervals after this as a result of the conducted impulses (from Sleigh, 1957). constant), similar decreases of frequency in a very viscous medium are accompanied by a decrease in wavelength. Considerable evidence concerning the metachronism of the lateral cilia of Mytilus and related lamellibranch molluscs has been accumulated, particularly by Gray (1930), Lucas (1932a, b), Aiello (1960) and Gosselin and associates (1958, 1961). Through- out these studies it has been the common experience that any factor which affects the frequency also changes the wave velocity. In drugs like veratrine or serotonin for example the frequency. 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 Sleigh, Michael A. Oxford, New York, Pergamon Press
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