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Critical thinking questions 1 & 4

1. a.) The membranes involved in Johns condition are the parietal pleura and the visceral pleura. b.) The parietal pleura lines the walls of the thoracic cavity, while the visceral pleura covers the lungs. c.) John’s condition is so painful because since the membranes are inflamed, there is less lubricating fluid being produced, resulting in the organs to stick together or drag across each other, causing extreme pain. 


4. Thirst sensation is part of a negative feedback mechanism. In negative feedback mechanisms, the output shuts off or reduces the original stimulus, which would be a person who does not drink water for a period of time until the ideal water level in the body is reduced, causing dehydration. The thirst sensation leads people to drink water, bringing the variable back to its ideal value. 

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Anatomy and Physiology Elana Schlansky

By ElanaSchlansky