BIOL 2500 Lecture Notes - Lecture 15: Central Nervous System, Central Chemoreceptors, Circulatory System
16 May 2017
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Document Summary
Sensing gaseous environment and what the brain is being exposed to. Maintaining appropriate levels of co2 and o2. H+ build up (decrease in ph) is measured here. Control exerted by receptors: 70% regulatory processes: peripheral chemoreceptors. Where body is most interested in measuring condition. Located within circulatory junctions: aortic arch, measures co2 (first) & o2, co2, most potent bc causing effect and maintained at tightest level, narrow homeostatic range, arterial co2. Receptors sensing level of waste product within arteriole circulation: direct result of co2: H+ produced decrease in ph ph monitored within central chemoreceptors brain sensitive to ph change . O2 decreases = pressures are hyperactive: blood leaving heart and going in to head and brain. Infant lung has a risk of becoming over inflated: hering-breuer reflex, autonomic reflex, lungs over inflate afferent signal via vagus nerve reach resp groups in brain stop inspiratory cycle cause efferent change. Uses action potentials (ap) which are very fast.
