HSC 332 ch.10 outline.docx

O linear increase in ventilation at work rates vo2

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continue to the linear rise in ventilation at work rates above 50% to 70% of VO2 max? o Linear increase in ventilation at work rates from 50%-75& VO2 max. o Ventilatory threshold (Tvent) is the inflection point where Ve increases exponentially. o The ventilary response is different in trained v.s. untrained individuals. In the trained individual there is; a decrease in arterial PO2 (near exhaustion), pH maintained at a higher work rate, and Tvent occurs at a higher work rate. Identify the location and function of chemoreceptors and mechanoreceptors that are thought to play a role in the regulation of breathing. o The respiratory system can be defined in two separate ways: neural and humoral. o Mechanoreceptors are located in the right ventricle of the heart and they send info back to the respiratory control center relative to the increase in cardiac output. Key role in sending info the respiratory control center at the beginning os an exercise. o Chemoreceptor’s are specialized neurons that respond to the changes in the internal environment (2 types) Central chemoreceptor’s are located in the medulla and are influenced by changes in PCO2 and H+ of the cerebrospinal fluid. Peripheral chemoreceptors are located in aortic and carotid bodies and they respond to increase in arterial H+ concentrations and PCO2.
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The carotid bodies are easily influenced by increases in blood potassium levels and decreases in arterial PCO2.
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  • Spring '14
  • BrianWallace
  • Oxygen hemoglobin dissociation, hemoglobin dissociation curve

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