18 Questions
What is the primary function of the Hering-Breuer inflation reflex?
To prevent over-inflation of the lungs
What type of nerve fibers innervate pulmonary irritant receptors?
Myelinated vagal nerve fibers
What is the stimulus for the Hering-Breuer deflation reflex?
Extreme deflation of the lungs
What is the response to stimulation of pulmonary irritant receptors?
Tachypnea and bronchoconstriction
What is the location of 'J receptors' in the lungs?
In the alveolar walls
What is the effect of cutting the vagi on the Hering-Breuer inflation reflex?
The reflex is abolished
What is the primary mechanism of quiet breathing?
Repetitive inspiratory signals from the dorsal respiratory group
What happens when the respiratory drive for increased pulmonary ventilation becomes greater than normal?
Respiratory signals spill over into the ventral respiratory neurons
What is the function of the pneumotaxic center?
To control the duration of inspiration
What is the role of the ventral respiratory neurons?
To contribute to both inspiration and expiration
What is the result of electrical stimulation of ventral respiratory neurons?
Either inspiration or expiration is stimulated, depending on the neuron
What is the location of the pneumotaxic center?
Dorsally in the nucleus parabrachialis of the upper pons
What is the outcome of cutting the vagus nerve on respiration?
Apnea
What type of receptors are located in the muscular walls of the bronchi and bronchioles?
Stretch receptors
What is the purpose of the Hering-Breuer inflation reflex?
To switch off the inspiratory ramp
What is the role of the dorsal respiratory group of neurons in the Hering-Breuer reflex?
To receive signals from stretch receptors
What type of receptors are stimulated by emotional stimuli from the hypothalamus and limbic system?
Nociceptors
What is the outcome of intact vagus nerve on respiration?
Regular rhythm of respiration
Test your knowledge of the Hering-Breuer reflexes, including the inflation reflex and deflation reflex, and their roles in regulating respiration and preventing lung overinflation and collapse.
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