Phys 1 Class 22
Regarding the Hering-Breuer Inflation Reflex, which of the following statements if False?
Action potentials from the stretch receptors pass withing the phrenic nerve to the medulla
Which structure of the brain stem is responsible for the initiation of inspiration?
Dorsal respiratory group (DRG)
Chemoreceptors in the carotid and aortic bodies regulate ventilation in response to all of the following except?
Increased in the PCO2
Stimulation of the apneustic center would result in
Pronlonged, deep inhalation
The most important chemical regulator of respiration is:
carbon dioxide
Peripheral chemoreceptors of the respiratory system are located in the
carotid and aortic bodies
The term hypercapnia refers to
eleveated PCO2
If the dorsal respiratory group of neuron in the medulla oblongata were destroyed
a person would stop breathing
Prolonged deep inspirations can result from stimulating the
apneustic center of the pons
Which of the following plays a part in the increase in ventilation with moderate exercise
reflexes from moving limbs
At higher inspiratory volumes, the apneustic center is inhibited by feedback from
stretch receptors (mechanoreceptors) in the lungs and pleura
Regarding the pneumotaxic center of the pons, which of the following statements is False?
the pneumotaxic center contains chemoreceptors sensitive to pO2 levels
Regarding the Hering-Breuer Inflation Reflex, which of the following statements if True?
-The Hering-Breuer reflex prevents overinflation of the lungs -Stretch receptors for the reflex are in the walls of the bronchi and bronchioles of the lungs -The Hering-Breuer reflex exerts an inhibitory influence on the DRG resulting in expiration
Regarding the pneumotaxic center of the pons, which of the following statements is True?
-The pneumotaxic center controles the "switch-off" point of the inspiratory ramps -the pneumotaxic center limits inspiration -The pneumotaxic center limits the bursts of action potentials in the phrenic nerve
Chemoreceptors in the carotid and aortic bodies regulate ventilation in response to all of the following:
-decrease in PO2 -decrease in pH -changes in blood pressure
Where are the afferenct receptors for the Hering-Breuer reflex located?
Bronchi and Bronchioles
at 10 percent increase in the level of carbon dioxide in the blood will
increase the rate of breathing
The apneustic centers of the pons
inhibit the pneumotaxic center
Central chemoreceptors of the respiratory system are located in the
medulla
The pneumotaxic center of the pons
modifies the rate an depth of breathing by terminating the inspiratory ramp signal of the DRG