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