. Advanced biology. Biology; Physiology; Reproduction. CHAPTER IX HUMAN TISSUES Bone cells build skeletons. Skeletons of fish and frog. How can the minute structure of the body he investigated f How is division of labor performed by the human body? What are bone and cartilage f How are the cells in a multicellular organism held together f If a thin slice of any portion of the human body is examined microscopically, it will be found to consist of a mosaic of minute units called cells. It will be further found that no cell conforms to the diagram of the typical cell. There are masses of similar
. Advanced biology. Biology; Physiology; Reproduction. CHAPTER IX HUMAN TISSUES Bone cells build skeletons. Skeletons of fish and frog. How can the minute structure of the body he investigated f How is division of labor performed by the human body? What are bone and cartilage f How are the cells in a multicellular organism held together f If a thin slice of any portion of the human body is examined microscopically, it will be found to consist of a mosaic of minute units called cells. It will be further found that no cell conforms to the diagram of the typical cell. There are masses of similar cells that build tissues, and these tissues build more complex structures called organs. Each organ has a special duty or function. In the human body there is greater specialization than in the higher plant. Each tissue or group of cells is adapted to perform a par- ticular physiological function. At the same time, all the functions necessary for life are carried on within each cell. The cell the unit of structure. Any function of an organism must be considered in relation to the function of tissues or of cells, because it is the individual cell that does the work. Fundamen- tally, each cell possesses the complete apparatus for life. Tissues can be compared to collections of single-celled organisms in that they perform most of the functions that the one-celled animals carry on ; but each group of tissue cells is fitted by shape, structure, location, or chemical powers to perform special functions necessary to the life of the complete organism of which it is a part. There- WH. FITZ. AD. BIO. — 6 73. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Book Company
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