Hyperinflation of lungs is prevented by-
Correct Answer: Hering Breuer reflex
Description: Ans. is 'a' i.e., Hering Breuer reflexo Hering-Breuer inflation reflex : This reflex is mediated by pulmonary stretch receptors in w hich inflation of lungs above a particular volume results in reflex inhibition of inspiration and initiation of expiration. The reflex tends to limit the tidal volume while increasing the respiratory frequency.o Hering-Breuer deflation reflex : - Rapid deflation of lungs tends to initiate prolonged inspiration, i.e., reflex hyperpnea in response to deflation.NameLocationStimulationAfferentResponseBaroreceptorsArterialCarotid sinus-9th nerve Aortic arch-1 Oth nerve|BPAff.-9th 10th NTS Eff.-Buffer n.|Sympathetic vasoconstrictor tone |Sympathetic discharge to heart |Parasympathetic discharge to heartCentral venous pressure receptorLt. atrium Pulmonary veins wall of great veins (SVC/Jugular veins) 10th nerve ChemoreceptorsCentralMedullaCO; HyperventilationPeripheralCarotid & Aortic bodyHemorrhage Hypoxia Hypercapnia acidosisStimulates VMCPeripheral Vasoconstriction |CO,|THR,|BPBainbridge ReflexesRt. atrium/vena cavaeRapid infusion of blood'saline (atrial distension) reflex tachycardiaBezold-Jariseh/ Coronary ChemoreflexLt. VentricleInj. of 5-HT, Veratrum Capsaicin, Nicotine in coronary artery Apnea, |-BP, |HR Tachypnea later onJ. Reflex/Pulmonary chemoreflexJuxtacapillary in walls of alveoli. C-fibresHyperinflation of lung (normal inspiration) -do-Cushing ReflexVMC|ICT | in blood supply ot VMC | systemic BP reflex | in HRHering Breuer Reflex-Inflation -DeflationAirway SM cellsSteady Lung inflation Mark deflation of lung| expiration | expiration
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now