5 Questions
What regulates the rhythmic discharges from the brain that produce spontaneous respiration?
The rhythmic discharges from the brain that produce spontaneous respiration are regulated by alternations in arterial PO2, PCO2, and H+ concentration, and this chemical control of breathing is supplemented by a number of nonchemical influences.
Explain the dependence of spontaneous respiration on nerve impulses from the brain.
Spontaneous respiration is dependent on nerve impulses from the brain, and breathing stops if the spinal cord is transected above the origin of the phrenic nerves.
Where is the voluntary system for control of respiration located?
The voluntary system for control of respiration is located in the cerebral cortex and sends impulses to the respiratory motor neurons via the corticospinal tracts.
What drives the automatic system for regulating respiration?
The automatic system for regulating respiration is driven by a group of pacemaker cells in the medulla.
Which muscles are activated by impulses from the pacemaker cells in the medulla for respiration?
Impulses from the pacemaker cells in the medulla activate motor neurons in the cervical and thoracic spinal cord that innervate inspiratory muscles, including the diaphragm via the phrenic nerves and the external intercostal muscles.
Test your knowledge about the regulation of respiration and the factors that influence spontaneous breathing. Learn about the role of arterial PO2, PCO2, and H+ concentration in regulating the rhythmic discharges from the brain for respiration.
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