Dyspnoea Refers To The Abnormal And Uncomfortable Awareness Of Breathing. Its Physiological Mechanisms Are Poorly Under-stood; Possible Afferent Sources For The Sensation Include Recep-tors In Respiratory Muscles, Juxta-capillary (j) Receptors (sense Interstitial Fluid), And Chemoreceptors (sensing Ico2 And Do2)-- Provided By Publisher.