Human Physiology: From Cells to Systems (7th Edition) by Lauralee Sherwood

By Lauralee Sherwood

HUMAN body structure, seventh version specializes in the mechanisms of physique functionality from cells to platforms and is equipped round the primary subject matter of homeostasis -- how the physique meets altering calls for whereas preserving the interior fidelity priceless for all cells and organs to operate. As an writer, Lauralee Sherwood is understood for the main updated and actual insurance in addition to powerful pedagogy making the textual content the simplest studying software. Plus, this system bargains a whole supplement of media instruments for studying and instructing. also, this new version has a wholly revised paintings application supplying practical and 3-dimensional paintings in addition to new circulation diagrams. the hot artwork software is helping scholars visualize tricky suggestions and tactics for larger realizing and mastery of innovations.

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Additional resources for Human Physiology: From Cells to Systems (7th Edition)

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Just as the functioning of an automobile depends on the shapes, organization, and interactions of its various parts, the structure and function of the human body are inseparable. Therefore, as we tell the story of how the body works, we will provide sufficient anatomic background for you to understand the function of the body part being discussed. Some structure–function relationships are obvious. For example, the heart is well designed to receive and pump blood, the teeth to tear and grind food, and the hingelike elbow joint to 1 permit bending of the arm.

This is the reason why strokes, which result in lost nerve cells in the brain, and heart attacks, which bring about death of heart muscle cells, can be so devastating. (a) Chemical level: a molecule in the membrane that encloses a cell (b) Cellular level: a cell in the stomach lining (c) Tissue level: layers of tissue in the stomach wall (d) Organ level: the stomach (e) Body system level: the digestive system (f) Organism level: the whole body ● FIGURE 1-1 Levels of organization in the body, showing an example for each level.

Room temperature is a controlled variable, a factor that can vary but is held within a narrow range by a control system. In our example, the control system includes a thermostat, a furnace, and all their electrical connections. The room temperature is determined by the activity of the furnace, a heat source that can be turned on or off. To switch on or off appropriately, the control system as a whole must “know” what the actual room temperature is, “compare” it with the desired room temperature, and “adjust” the output of the furnace to bring the actual temperature to the desired level.

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