Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . form a highly im-portant process in all animal and veget^lble solid portions of plants, and the tissues of animalbodies, are formed directly by the deposition of cells, orby the indirect elaboration of their fluid contents. Theyare concerned, not only in the functions of nutrition, inthe development and restoration of parts, but in absorp-tion and secretion. They are developed into tissue
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . form a highly im-portant process in all animal and veget^lble solid portions of plants, and the tissues of animalbodies, are formed directly by the deposition of cells, orby the indirect elaboration of their fluid contents. Theyare concerned, not only in the functions of nutrition, inthe development and restoration of parts, but in absorp-tion and secretion. They are developed into tissues invarious ways. In some, the cell-membranes become elon-gated, and are folded and divided into threads or filamentsof exceeding fineness. 32. Tubules, or little tubes, are several cells elongated,and placed end to end—the partitions being removed. 33. Filaments, or fibrils, are exceedingly delicate threads,composed ofrminute particles, usually arranged in parallelbundles or fasciculi. {Fig. 2.) Of what are the tissues made up? What are granules? Where are gran-ules found? What are cells? How are cells developed into tissues? Whatare tubules? What are filaments? OF .ANIMAL BODIES. 21. Fig. 2.—Fasciculi and fibres of cellular tissue. A, White fibrous element, with cell-nuclei visit Ie in itB, Yellow fibrous element, showing its branching fibrils. C, Finer fibrils of the yellow element. 34. Fibres are larger than fibrils, but are similar in otherrespects. 85. A tissue is the union or interlacement of one ormore of these primary structures. 36. An organ is an instrument composed of tissues, anddesigned for action. Its action is called its function oruse. Thus, the liver is an organ, and the secretion of bileits function. 87. An apparatus consists of a number of differentorgans, arranged for the performance of some one teeth, mouth, stomach, intestines, &c, belong to thedigestive apparatus. 38. A system is a connected series of similar parts, suchas the muscular or
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysiologicalprocess
