. Elements of human physiology. Physiology. THE CONTEACTLLE TISSUES 157 Amceboid Movement We have already described amceboid movement as seen in the amoeba and the white blood-corpuscles. It only remains to enumerate the chief factors that influence its activity. Amoeboid movements can occur only within certain limits of temperature (about 0'' C. to 40°) ; within these limits it is the more active the higher the temperature. At about 45° the cell goes into a condition resembling heat rigor. The fluid in which the corpuscles are suspended is of great importance. Distilled water, almost all salt
. Elements of human physiology. Physiology. THE CONTEACTLLE TISSUES 157 Amceboid Movement We have already described amceboid movement as seen in the amoeba and the white blood-corpuscles. It only remains to enumerate the chief factors that influence its activity. Amoeboid movements can occur only within certain limits of temperature (about 0'' C. to 40°) ; within these limits it is the more active the higher the temperature. At about 45° the cell goes into a condition resembling heat rigor. The fluid in which the corpuscles are suspended is of great importance. Distilled water, almost all salts, acids Fig. Tracing of contraction of adductor muscle of claw of crayfish, showing inhibition resulting from stimulation of its nerve (at b) by means of a constant current. The break of the current causes a second smaller inhibition. (Biedermann.) and alkalies, if strong enough, stop the action and kill the cell. The movements are also stopped by CO^ or by absence of oxygen. Artificial excitation, whether electrical, chemical, or ther- mal, causes universal contraction of the corpuscle, which therefore assumes the spherical form. Ciliary Movement Cilia are met with in man in nearly the whole of the respiratoi^Y passages and the cavities opening into them, in the generative organs, in the uterus and Fallopian tubes of the female, and the epididymis of the male, and on the ependyma of the central canal of the spinal cord and its continuation into the cerebral 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 Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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