The book The Philosophy of Biology was written by author James Johnstone Here you can read free online of The Philosophy of Biology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Philosophy of Biology a good or bad book?
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Further changes in the characters of the cell-substance, and in the nucleus, can be observed, and all these indicate that the proto- plasm of the cells, as the result of stimulation, elaborates THE ACTIVITIES OF THE ORGANISM 99 certain substances ; that these substances are then washed out, so to speak, into the duct by the withdrawal of water from the cell ; and that thereafter the cell absorbs fresh nutritive material from the lymph which exudes from the blood vessels, along with water. The d...istinctive part of the whole train of processes is, then, this elaboration of material by the cells them- selves ; while the concomitant changes in the calibre of the blood vessels and in the flow of blood and lymph are subsidiary ones. In the process of secretion of saliva energy is absorbed from the chemical substances of the blood to bring about the passage of water from a region of high to a region of low osmotic pressure ; oxygen and nitrogen, with other elements of course, are withdrawn from the arterial blood stream for the purpose of the secretion, and carbon dioxide and other substances are given off to the venous blood and lymph.
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