Chapter 01: Functional Organization of the Human Body and Control of the “Internal Environment” Hall: Guyton and Hall Textbook of Medical Physiology, 15th Edition Test Bank MULTIPLE CHOICE 1. Which of the following statements is incorrect? a. Positive feedback usually promotes a change and may be associated with vicious cycles and progressive disease. b. Some positive feedback systems may be useful and part of an overall negative feedback process. c. Some physiological variables such as blood pressure, cardiac output, blood cortisol concentration, and metabolic rate change significantly throughout the day in healthy persons. d. In most diseases, homeostatic mechanisms are completely inoperative. e. In many diseases, the body’s compensatory mechanisms may lead to deviations from the normal range in some body functions. ANS: D 2. If the feedback gain of a control system is -3.0, this means that the system is a. A negative feedback system capable of correcting 1/3 of the initial disturbance to the system b. A negative feedback system capable of correcting 2/3 of the initial disturbance to the system c. A negative feedback system capable of correcting 3/4 of the initial disturbance to the system d. A positive feedback system that exacerbates the initial disturbance to the system by 33% e. A positive feedback system that exacerbates the initial disturbance to the system by 75% f. A positive feedback system that exacerbates the initial disturbance to the system by 3-fold ANS: C 3. Which of the following statements about homeostasis is incorrect? a. It refers to the maintenance of a stable internal environment for the body. b. Homeostatic mechanisms do not operate in diseases. c. Homeostasis requires integrated actions of the cells, tissues, organs, and multiple nervous, hormonal, and local control systems. d. Homeostatic compensations that begin after a major environmental challenge may contribute to abnormalities of body function. ANS: B 4. What is the most abundant type of cell in the human body?
Copyright © 2026 by Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Guyton and Hall Textbook of Medical Physiology 15e Hall Test Bank