HK 4550 Midterm: 2 - Carriage of CO2 & O2, ventilation (END OF MIDTERM 1).pdf

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17 Apr 2013
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West - chapter 6 (up to page 83) It must be adaptable to the needs of the organism. Voluntary (corticospinal tract) and automatic (bulbospinal tract) pathways that control breathing. Motor fibers of the corticospinal tract originate in the cerebral cortex, cross over in the medulla, and descend in the spinal cord. Motor fibers of the bulbospinal tract originate in the respiratory neurons of the medulla, cross over at or near the upper cervical cord, and descend in the spinal cord. The fibers synapse with the phrenic motor neurons that innervate the diaphragm. Effects of o2 on peripheral chemoreceptors e s n o p s e. Effects of co2 on ventilation i n m. Modulation of co2 ventilatory response i n m. Effects of o2 on ventilation i n m. Other receptors: irritant, j receptors, c-fibers, upper airway receptors, joint and muscle receptors, muscle spindles of the diaphragm, arterial baroreceptors, pain and temperature.

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