Respiratory Center


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respiratory center

[′res·prə‚tȯr·ē ¦sen·tər]
(physiology)
A large area of the brain involved in regulation of respiration.

Respiratory Center

 

several groups of nerve cells (neurons) located in various sections of the central nervous system, primarily in the reticular formation of the medulla oblongata. The continuous coordinated rhythmic activity of these neurons ensures the initiation of respiratory movements and their regulation in conformity with changes occurring in the body.

Impulses from the respiratory center enter the motor neurons of the anterior horns of the cervical and thoracic sections of the spinal cord, from which the excitation is transmitted to the respiratory musculature. The activity of the respiratory center is regulated humorally—that is, by the composition of the blood and interstitial fluid that bathe it. Its activity is also regulated by reflexes, in response to impulses entering from receptors in the respiratory, cardiovascular, motor, and other systems, as well as from the higher sections of the central nervous system. When entry of nerve impulses into the respiratory center is blocked, the respiratory center maintains its activity by so-called automatism of the respiratory center and is capable of ensuring respiratory movements.

References in periodicals archive ?
First, it has a stimulating effect on the respiratory centers in the brain;
The authors would like to thank the University of Sulaimani for supporting the project and the staff of SHAR Hospital Respiratory Center in Sulaimani city for technical assistance.
The respiratory center stimulation results in hyperventilation and excess wash out of carbon dioxide (C[O.sub.2]).
As the duration of breath holding during pranayama is gradually increased by the practice of pranayama so that the respiratory center is acclimatized to withstand higher and higher carbon-di-oxide concentrations in the alveoli and the blood.
This ultimately triggers the stimulation of the respiratory center in the brain, which causes the person to awaken briefly to take some quick, deep breaths.
Observation of newborns will reveal that most all of them have irregular respiratory patterns, characterized by periods of rapid breathing followed by brief pauses in respiratory effort, termed "periodic breathing." This is also felt to be due to respiratory center immaturity but is NOT considered abnormal unless associated with decrease heat rate or color change.
(8, 14) In the present study, improved pulmonary function in luteal phase might be related to high progesterone level which induces hyperventilation by : 1.Direct stimulation of respiratory center. (15) Respiratory response to progesterone is mediated at a hypothalamic site through an estrogen (E2) dependent progesterone receptor (PR) mediated mechanism requiring RNA and protein synthesis (gene expression).
The blood oxygen saturation decreases during an episode of apnea, which ultimately activates the respiratory center in the brainstem.
Depression of the respiratory center such as with anesthetics, sedative (morphine), cerebral trauma or tumors.
Furthermore, practice of Pranayama may lead to alteration in responsiveness of medullary respiratory centers as well as central and peripheral chemoreceptors increasing respiratory endurance and BHT.
Other manifestations reported in the literature include nausea, vomiting, keratoconjunctivitis, blurred vision, photophobia, blepharospasm, and lacrimation.4 In lethal H2S exposure, sulfides act on the respiratory centers of the brain causing respiratory paralysis.