Get Guyton and Hall Textbook of Medical Physiology: Enhanced PDF

By John E. Hall PhD

The twelfth variation of Guyton and corridor Textbook of scientific body structure keeps this bestselling title's lengthy culture as one of many world's favourite body structure textbooks. The large luck of this ebook is because of its description of advanced physiologic rules in language that's effortless to learn and comprehend. Now with a stronger colour artwork software, thorough updates reflecting today's drugs and technology, this textbook is a superb resource for studying crucial human body structure wisdom. research and bear in mind important ideas simply because of brief, easy-to-read, masterfully edited chapters and a straightforward full-color layout. See middle thoughts utilized to real-life events with medical vignettes through the textual content. detect the most recent in body structure with updates that mirror the most recent advances in molecular biology, cardiovascular, neurophysiology and gastrointestinal subject matters. Visualize physiologic ideas truly with over one thousand daring, full-color drawings and diagrams. Distinguish center options from extra in-depth fabric with a format that makes use of grey shading to obviously differentiate among "need-to-know" and "nice-to-know" info. This re-creation keeps the lengthy culture of "Guyton" as one of many world's favourite body structure textbooks

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Additional info for Guyton and Hall Textbook of Medical Physiology: Enhanced E-book

Sample text

In the human body, essentially all carbohydrates are converted into glucose by the digestive tract and liver before they reach the other cells of the body. Similarly, proteins are converted into amino acids and fats into fatty acids. Figure 2-14 shows oxygen and the foodstuffs—glucose, fatty acids, and amino acids—all entering the cell. Inside the cell, the foodstuffs react chemically with oxygen, under the influence of enzymes that control the reactions and channel the energy released in the proper direction.

Most cells that exhibit ameboid locomotion move toward the source of a chemotactic substance—that is, from an area of lower concentration toward an area of higher concentration—which is called positive chemotaxis. Some cells move away from the source, which is called negative chemotaxis. But how does chemotaxis control the direction of ameboid locomotion? Although the answer is not certain, it is known that the side of the cell most exposed to the chemotactic substance develops membrane changes that cause pseudopodial protrusion.

If not, the brain corrects the feed-forward signals that it sends to the muscles the next time the movement is required. Then, if still further correction is necessary, this will be done again for subsequent movements. This is called adaptive control. Adaptive control, in a sense, is delayed negative feedback. Thus, one can see how complex the feedback control systems of the body can be. A person’s life depends on all of them. Therefore, a major share of this text is devoted to discussing these life-giving mechanisms.

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Guyton and Hall Textbook of Medical Physiology: Enhanced E-book by John E. Hall PhD


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