lec2basics2007(short)

lec2basics2007(short) - TODAY: some basic concepts...

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    TODAY: some basic  concepts •Homeostasis-vs-steady  state •Laws of  thermodynamics •Enzyme action •Energy substrates  (macronutrients) Carbohydrate  Fat  Protein
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    Basic concepts Homeostasis -  the condition in which the body’s internal environment remains  relatively constant, within limits ( homeo  = same;   statis  = standing still). Negative Feedback System :   Responses of a biological control system that oppose the  initial stimulus. N orm a l b lo od su ga r In cr ea s b lo od su ga le ve l Ò Str es  ca us es de c re ase  of  blo suga r lev e l S tim ula tes  re lea se o f  glu ca g (ho rmo e) Acc el er at g lyco lyss in  the  li ve r  (br eakd  o f g lycoge  in to g luc se INP UT R e tu rn  to  hom eo s tas is OU TP U 1 2 3 4 5
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    Steady state :   seemingly constant conditions, not  homeostasis.  During exercise, SS refers to certain functions  which have attained constancy at a new level 12 10 8 6 4 2 0 0 1 2 Time    Resting  steady state    Exercise  Steady state
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    2 molecules of GADPH Glycolysis – detailed view Anaerobic pathways of  ATP production
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    Kinds of Energy ? Two important things to remember about energy: 2. It is not created, only converted from one form to another. 3. Energy conversions are not 100% efficient. Thermodynamics:   The physical science dealing with energy exchange.    Energetics:   Bioenergetics:   the science dealing with energetic events in the  biological world. Why study bioenergetics?  The ability to do work (exercise) depends on  the ability to convert energy from one form (carb., fat, protein) to  another (ATP), and finally into work.
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    Laws of Thermodynamics (Energetics); 1 st  Law:  Energy is not created, nor is it destroyed. •the energy balance equation in humans to describe weight gain 
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This note was uploaded on 04/13/2008 for the course ABIO 365 taught by Professor Brutsaert during the Spring '08 term at SUNY Albany.

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lec2basics2007(short) - TODAY: some basic concepts...

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