HPHY 371 Exam 2 Questions and Answers

RER vs RQ and 1 - RER can be greater than 1 RQ cannot be greater than 1 Factors concering maximal Oxygen Uptake VO2 max - Central factors: oxygen delivery -pulmonary diffusion, blood volume, cardiac output Peripheral factors (oxygen uptake/use) -capillary density, mitochondrial mass VO2 max criteria: plateau, RER >1.1, [lactate] > 8 mmol/L, HR 220-age, RPE>15 RER >1 - RER= CO2/O2 greater than 1 = CO2 from other sources other than mitochondrial metabolism -Bicarbonate buffering acidosis -> H+ + HCO3- <-> H2CO3 <-> CO2 + H20 LeChateliers principle says that during exercise H+ accumulation causes reaction to shift toward the right and produce more CO2 to be exhaled. VO2 max: graphed as time and as workrate - Lean Body Mass vs. Resting Energy Expenditure - Linearly related -more muscle= higher energy expenditures Absolute vs Relative VO2 - Absolute: L*min-1 -absolute amount of O2 consumed Relative: ml*kg-1*min-1 -amount of O2 consumed per lbs.