General physiology; an outline of the science of life . part to those of fat-metamorphosis. As in the latter fat,so in the former mucus, is formed from the living substance of the 1 Cf. p. 163. THE GENERAL CONDITIONS OF LIFE 333 cell. In many cases the mucus that appears contains genuine mucin,in others it consists of mucinoid substances, but it is always acompound of proteid with some kind of It is seen,therefore, that in mucous metamorphosis the origin of the mucuslies in the proteid. Mucous metamorphosis occurs also normallyin the healthy body, especially in the cells of the
General physiology; an outline of the science of life . part to those of fat-metamorphosis. As in the latter fat,so in the former mucus, is formed from the living substance of the 1 Cf. p. 163. THE GENERAL CONDITIONS OF LIFE 333 cell. In many cases the mucus that appears contains genuine mucin,in others it consists of mucinoid substances, but it is always acompound of proteid with some kind of It is seen,therefore, that in mucous metamorphosis the origin of the mucuslies in the proteid. Mucous metamorphosis occurs also normallyin the healthy body, especially in the cells of the mucous membranesof the respiratory and intestinal tracts, as well as of the urogenitalsystem. In the formation of mucus by these mucous cellsunder normal conditions the whole cell never perishes, but a partonly of its protoplasm is transformed into mucus. Almost alwaysmucous cells are cylindrical cells: their basal part contains thenucleus, and their upper end bounds the free surface of themucous membrane. It is always the upper, free end of the Cell-.
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