KINE 3012 Lecture Notes - Lecture 9: Peripheral Chemoreceptors, Chemoreceptor, Partial Pressure
3 Dec 2013
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Higher pressure of o2 in lungs --> hbo2. Lower pressure of o2 in tissue --> hb + o2. This system allows us to have a larger amount to be transported while maintaining partial pressure. Cell usage o2 and production co2 --> metabolic rate. 2 types of control for diaphragm and intercostals muscles, voluntary and involutary. Pons and medulla is the control centre of this involuntary breathing. Chemoreceptors, sense chemicals, 2 categories: peripheral, *aorta and carotid* Carotid chemoreceptor is the one that tests co2 and h: medulla, central chemoreceptor. If we increase oxygen in our alveoli, there would not have any effect on breathing. Reduce in oxygen doesn"t affect much until 60 mmhg of oxygen which causes 15% larger breaths. Change in the chemoreceptors causes these changes. Chemoreceptor has a constant rate of fire, impulses are sent to respiratory centre and are detected. Oxygen drops, brain doesn"t sense it, however it detects the chemoreceptor now with an increase rate of fire.
