NSE 22A/B Chapter Notes - Chapter Oxygenation: Congenital Heart Defect, Cerebral Cortex, Auscultation
6 Feb 2016
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Document Summary
Adequacy of circulation, ventilation, perfusion, and transport of respiratory gases to the tissue is influenced by 4 types of factors: physiological, developmental, lifestyle, environmental. Atmospheric o2 concentration is lower and inspiratory o2 concentration decrease. Prevents lowering of diaphragm and reduce anteroposterior diameter of thorax on inspiration, reducing volume of air inspired. Maintains rhythm and depth of respiration and balance between inspiration and expiration. Voluntary control of respiration delivers impulses to the respiratory motor neuron by way of spinal cord; accommodates speaking, eating and swimming. Maintains appropriate rate and depth of respiration according to hypoxia. Decrease chest wall motion (e. g. from musculoskeletal impairment) Chemoreceptors change in the blood co2, o2, and hydrogen ion concentration. Located in the medulla, aortic body, and carotid body. Changes in the chemical content of 02, c02, and h+ stimulate chemoreceptors, which in turn stimulate neural regulators to adjust rate and depth of ventilation to maintain normal arterial blood gas levels.
