What is one of the sensations caused by J-receptors when stimulated?

• A. Increased appetite
• B. Shortness of breath
• C. Decreased heart rate
• D. Enhanced lung capacity

Answer: (B)

J-receptors, or juxtacapillary receptors, are located in the lungs and play an important role in the respiratory system. When these receptors are stimulated, particularly by factors such as pulmonary edema, increased interstitial fluid, or inflammation, they trigger sensations of shortness of breath, also known as dyspnea. This response is a protective mechanism, prompting increased respiratory effort to assist in gas exchange and oxygenation when the lungs are experiencing distress or compromised function.

This sensation is essentially a signal to the body that something is wrong with the lung tissue or function, and it may compel a person to breathe more rapidly or deeply in an effort to improve oxygen delivery and remove carbon dioxide. This is significant in various clinical scenarios, as understanding the function of J-receptors can help in diagnosing and managing respiratory conditions where these receptors may be activated. Thus, shortness of breath is a direct and important sensation caused by the stimulation of J-receptors in response to problematic conditions in the lungs.