Lecture4 - Lecture#4 Levels of Metabolism the dog B Levels...

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Lecture #4 Levels of Metabolism 08/07/2008 15:19:00 * the dog B. Levels of metabolism 1.Minimum metabolic rate  “maintenance”=minimum metabolic demand o Strict conditions for measuring minimum metabolic rate 1. animal needs to be fasted (no food in stomach) 2. animal needs to be a rest, thermally neutral environment (endotherms) 3. adult, non-pregnant, non-lactating *Kleiber conditions a.) Basal metabolic rate (BMR) o Endothermic animals “warm blooded”- internal heat source Mammals and birds b.)Standard metabolic rate (SMR) o Ectothermic animals “cold blooded”- external heat source Everything but mammals and birds (lizards, bugs, etc.) 2. Resting metabolic rate (RMR) o × BMR for mammals o alert, pre-exercise o Human: RMR= 440kJ/hour   BMR=270kJ/hour 3. Active metabolic rate o Exercising 10-25  ×  BMR up to VO2 max o Humans: ~ 10 × BMR o Certain canids: 25 × BMR 4. Average Daily Metabolic rate: measure metabolism by taking all metabolic rates in to account over 24 hour period Aerobic Metabolism     Oxygen is ultimately required for the complete breakdown of fuels-lipids, carbs, proteins- for maximum energy  payout   ATP Respiratory: ambient air to lungs Cardiovascular: moving O2 + CO2 in the blood Skeletal muscles: ultimately consumes O2 Digestive system: provides fuel for all processes, fuel to get ATP ALL WORK TOGETHER toward producing and using ATP
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Respiratory System I 08/07/2008 15:19:00 I. Main functions
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A. Gas exchange: primary function 1. move O2 from air   venous blood 2. move CO2 out B. remove some compounds from blood 1. metabolize      compounds 2. filter toxic compounds from circulation C. regulate blood pH II. movement of gases (diffusion) * O2 + CO2 move by simple diffusion across living surfaces A. barrier must be exceedingly thin
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