Text book of Elementary Zoology for Secondary Educational Institutions
Text book of Elementary Zoology for Secondary Educational Institutions
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In our eReader you can find the full English version of the book. Read Text book of Elementary Zoology for Secondary Educational Institutions Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Text book of Elementary Zoology for Secondary Educational Institutions
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The fibres are merely outgrowths which conduct impulses to and from the ganglia.
The ganglion cells are massed together in nerve centres, such as the brain. The term ganglion is also applied to one of these groups of cells. When several fibres are bound together they are called a nerve.
The ganglion cell and its various fibres are to be looked upon as a unit. Fig. 25 shows the parts of such a unit. The whole nervous system of an animal is made up of numerous units of this type more or less join...ed together.
Nervous tissue arises in the embryo from the ectoderm. It is so highly specialized that its cells are probably incapable of division after they are once differentiated. This means that all the nervous cells are produced early in life, and that under ordinary circumstances no new ones are formed. Probably all we can do with them is to educate more highly those that we have.
131. Organs. The tissues which have just been described are rarely, if ever, pure and independent; but are associated with one another in different ways.
What to read after Text book of Elementary Zoology for Secondary Educational Institutions?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Walton Galloway to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The fibres are merely outgrowths which conduct impulses to and from the ganglia.
The ganglion cells are massed together in nerve centres, such as the brain. The term ganglion is also applied to one of these groups of cells. When several fibres are bound together they are called a nerve.
The ganglion cell and its various fibres are to be looked upon as a unit. Fig. 25 shows the parts of such a unit. The whole nervous system of an animal is made up of numerous units of this type more or less join...ed together.
Nervous tissue arises in the embryo from the ectoderm. It is so highly specialized that its cells are probably incapable of division after they are once differentiated. This means that all the nervous cells are produced early in life, and that under ordinary circumstances no new ones are formed. Probably all we can do with them is to educate more highly those that we have.
131. Organs. The tissues which have just been described are rarely, if ever, pure and independent; but are associated with one another in different ways.
What to read after Text book of Elementary Zoology for Secondary Educational Institutions?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Walton Galloway to read onlineMoreLess
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