HESI ADVANCED PATHOPHYSIOLOG V1

HESI ADVANCED PATHOPHYSIOLOG V1 .1. According to Walter B. Cannon, homeostasis is a stable internal environment achieved through a system of: A) Interdependent system-wide adaptive responses B) Variable internal and external conditioning factors C) Coordinated physiologic processes that oppose change D) Compatibility between cells and the internal environment Ans: C Feedback: Walter B. Cannon identified homeostasis, achieved by a coordinated physiologic process that opposes change. Claude Bernard recognized the importance of compatibility between cells and the internal environment. Hans Selye identified the general (systemic) adaptive and interdependent responses to stress. According to Selye, stressors produce different responses due to the influence of adaptive internal or external factors (conditioning factors). 2. A child has been experiencing hypoglycemic episodes. “How does the body know when to secrete insulin and when to stop secreting it?” The best response by the nurse, explaining the physiologic background, would be: A) “The body knows that if the blood glucose level falls, it will inhibit insulin secretion and release glycogen to release glucose from the liver.” B) “It's just a big guessing game; first we give sugar like orange juice, and then we withhold the carbohydrates if the blood glucose level is too high.” C) “Your pituitary gland in the brain is the 'master gland,' and it controls and regulates all the hormones.” D) “Once the child starts getting confused, the brain will send a message to the pancreas to stop producing insulin.” Ans: A Feedback: In the negative feedback mechanism that controls blood glucose levels, an increase in blood glucose stimulates an increase in insulin, which enhances removal of glucose from the blood. When glucose has been taken up by cells and blood glucose levels fall, insulin secretion is inhibited and glucagon and other counterregulatory mechanisms stimulate release of glucose from the liver, which causes blood glucose levels to return to normal.