Calcium levels in Mr. Gallariani's blood are dropping to dangerously low levels. The hormone PTH is released and soon blood calcium levels begin to rise. Shortly after, PTH release slows. Is this an example of a positive or negative feedback mechanism? What is the initial stimulus? What is the result?
Ch. 1 The Human Body: An Orientation

1장, 문제 24
Aiden has been suffering agonizing pain with each breath and has been informed by the physician that he has pleurisy.
a. Specifically, what membranes are involved in this condition?
b. What is their usual role in the body?
c. Explain why Aiden's condition is so painful.
검증된 단계별 안내1
Identify the membranes involved in pleurisy: Pleurisy affects the pleura, which are the two thin membranes surrounding the lungs and lining the chest cavity. These are the visceral pleura (covering the lungs) and the parietal pleura (lining the chest wall).
Explain the usual role of these membranes: Normally, the pleura produce a small amount of lubricating fluid that allows the two layers to slide smoothly over each other during breathing, reducing friction between the lungs and chest wall.
Describe what happens in pleurisy: In pleurisy, inflammation causes the pleural membranes to become rough and irritated, which disrupts the smooth sliding motion and increases friction.
Explain why this condition causes pain: The increased friction between the inflamed pleural layers stimulates pain receptors, especially during breathing movements, leading to sharp, agonizing pain with each breath.
Summarize the connection: Therefore, the pain in pleurisy arises because the normally lubricated pleural membranes are inflamed and rubbing against each other, making breathing painful.

비슷한 문제에 대한 검증된 영상 답변:
이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
2m주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Pleura and Its Membranes
The pleura are two thin membranes surrounding the lungs and lining the chest cavity. The visceral pleura covers the lungs, while the parietal pleura lines the chest wall. These membranes create a pleural cavity filled with lubricating fluid to facilitate smooth lung movement during breathing.
추천 영상:
가이드 코스
Biological Membranes
Function of the Pleural Membranes
The pleural membranes reduce friction between the lungs and chest wall as the lungs expand and contract. The lubricating fluid allows the membranes to slide effortlessly, enabling painless and efficient breathing. They also help maintain lung expansion by creating a pressure gradient.
추천 영상:
가이드 코스
Membrane Protein Functions
Cause of Pain in Pleurisy
Pleurisy is inflammation of the pleural membranes, causing them to become rough and irritated. This inflammation leads to friction during breathing, resulting in sharp, agonizing pain with each breath. The pain worsens with deep breaths or coughing due to increased membrane movement.
추천 영상:
Organization of the Body: Serous Membranes Example 2
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