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Unformatted text preview: Biology 225 Principles of Animal Physiology Name__Answer Key_____ Exam 1 (100 pts) Fall 2006 (Denver) 28 questions total; Two sections (Part I – pp. 1-6; Part II – pp. 8-10) Part I. Multiple Choice (total 60 points). Each question is worth 2.5 points. Answer all of the questions. Multiple choice questions have only one answer. CHOOSE THE BEST ANSWER! a) The purpose of the Scientific Method is to find proof for a hypothesis through observation and experimentation. b) The purpose of the Scientific Method is to find support for or against a hypothesis through observation and experimentation. c) The purpose of the Scientific Method is to provide doctrine that is then published in textbooks. d) The purpose of the Scientific Method is to provide a framework for belief systems of how the natural world works. e) a and d. 2.) The French physiologist Claude Bernard was the first to describe the concept of homeostasis, which he termed the internal milieu. The internal milieu refers to: a) a condition of equilibrium within the internal environment. b) a condition of disorder within the internal environment. c) a condition of constant change within the internal environment. d) a condition of constancy within the internal environment. e) a condition of high osmolarity within the internal environment. 1.) Which of the following are valid statements regarding the Scientific Method: 3.) Which of the following best describes the concept of allostasis? a) The maintenance of homeostasis under resting conditions. b) The maintenance of stability through the generation of disorder. c) The maintenance of stability through change. d) The maintenance of homeostasis or equilibrium state. e) None of the above. 4.) In mammals, arterial baroreceptors located in the carotid sinus and aortic arch sense changes in blood pressure. When blood pressure rises, afferent nerves send signals from these baroreceptors to the brain where they provide input to neurons of the cardiovascular control centers. This results in physiological adjustments that serve to lower blood pressure, such as changes in vascular tone and cardiac output. Which of the following general terms best describes the physiological response to increased blood pressure? a) feedforward control b) positive feedback c) negative feedback d) equilibrium control e) cardiac threshold response 5.) In negative feedback, a stimulus triggers a response to counteract further change in the same direction. Which of the following best describes negative feedback? a) Negative-feedback mechanisms prevent small changes from becoming too large. b) Negative-feedback mechanisms prevent large changes from altering physiological output....
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