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Page 807
... nerve impulses indiscriminately throughout the body , but instead speeds them to the critical points of response . The develop- ment that accomplishes this is a central nerve cord . The flatworms are the first to develop a " central ...
... nerve impulses indiscriminately throughout the body , but instead speeds them to the critical points of response . The develop- ment that accomplishes this is a central nerve cord . The flatworms are the first to develop a " central ...
Page 817
... nerve fibers that run up and down the cord , unifying the whole . Those that conduct impulses downward from the brain are the " descending tracts " and those that conduct them upward ... nerves always produced their 817 THE MIND Nerve Action.
... nerve fibers that run up and down the cord , unifying the whole . Those that conduct impulses downward from the brain are the " descending tracts " and those that conduct them upward ... nerves always produced their 817 THE MIND Nerve Action.
Page 823
... nerve fiber comes to a synapse — a gap between one nerve cell and the next ? Apparently , the nerve impulse also involves the pro- duction of a chemical that can drift across the gap and initiate a nerve impulse in the next nerve cell ...
... nerve fiber comes to a synapse — a gap between one nerve cell and the next ? Apparently , the nerve impulse also involves the pro- duction of a chemical that can drift across the gap and initiate a nerve impulse in the next nerve cell ...
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alpha particles American amino acids animals antiproton astronomer atmosphere bacteria biochemist blood body brain called carbon atoms carbon dioxide cells cent century chain charge chemical chemist chemistry chromosomes compound containing detected developed discovered discovery disease distance earth electric electrons elements energy enzyme fission galaxies gases gene German glucose gravitational Greek word heat helium hemoglobin hormone human hydrogen hydrogen atoms instance isotope light light-years liquid living magnetic field mass measure metal miles per second million molecule moon motion named nature nerve neutrino neutron nitrogen Nobel Prize nuclear nucleic acid nucleus ocean orbit ordinary organic oxygen particles physicist plant possible produced protein proton quantity quasars radiation radio radioactive reaction rotation scientists seemed showed solar space speed stars structure substances surface temperature theory thorium tion tissue turned universe uranium velocity virus vitamin wavelength waves white dwarfs word meaning X-rays