Hphy 371 Study guides, Class notes & Summaries

Work - product of force and the distance through which the force acts W=Force x Distance Measured in Neutonmeters or Joules Power - how much work is accomplished per unit of time P= W/T Measured in Watts Ergometry - Measurement of the work output Example: Bench step in which the participant steps up and down on a bench at a specified rate -Erogemter, treadmill, cycler Calorie - amount of heat required to raise the temperature of one gram of water by one degree Celcius Direct ca...

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 ...

Direct calorimetry - process of measuring a person's metabolic rate via the measurement of heat production -direct measurement of metabolic rate Indirect calorimetry - direct relationship between O2 consumed and amount of heat produced -O2 consumption, CO2 production, N2 balance Oxygen deficit - -a lag due to slower activation of oxidative pathways -difference between oxygen uptake in the first few min of exercise and after an equal time period of steady state What is the steady s...

Which of the following is a clear example of internal work? A. Lifting a barbell 2 meters B. Breaking down phosphocreatine to creatine, which is an exergonic reaction and releases energy C. Using energy to transport calcium into the sarcoplasmic reticulum against a chemical gradient D. All of the above E. None of the above - C Which of the following statements is TRUE of power output? A. Power output can be measured on both a cycle ergometer and level treadmill B. Power outp...

3 cardiovascular adjustments - 1. ANS adjustments which increase Q 2. Redistribution of Q 3. Increased venous return in proportion to increased Q Q - cardiac output = (EDV - ESV) x HR - increases with increased exercise intensity Fick equation - VO2, Q, and aterial-venous O2 difference O2 content - O2 bound to Hb + O2 dissolved in plasma O2 content in different areas of the body - active muscle < mixed < inactive < arterial arterial capacity, arterial content, mixed ve...

Of the factors that can influence stroke volume, which do you think contributes to the rise in stroke volume during exercise? Increased afterload Increased contractility Increased heart rate All of the above - increased Contractility Based on the Krogh hydraulic model, which of the following would increase preload during exercise? Vasodilation of skin blood vessels Vasodilation of splanchnic blood vessels Vasodilation of skeletal muscle blood vessels None of the above - None of t...

Which energy system supports the greatest maximum rate of ATP synthesis? - ATP-PC Which muscle cells will experience glycolysis ending in lactate as a result of contraction? - Type 1, Type 11a, Type 11x = all muscle fibers capable of all energy systems During heavy exercise, glycolysis is anaerobic because there is low oxygen available in the cell. (t/f) - False- there is always enough oxygen, it simply cannot be utilized during heavy exercise What inhibits hexokinase? - glucose-6-phosp...

Homeostasis - dynamic equilibrium maintained by an organism and the environment in order to maintain biologically critical variables remaining constant Regulated Variable - targets of homeostasis Controlled Variables - variables change to minimize displacement of regulated variables stressor - environmental factor which displaces the body from homeostatic conditions stress - passive bodily displacement specific to stressor response - tries to limit the acute displacement related t...

HPHY 371 Exam 2 Questions and Answers.