5.1 Energy Transfer
Energy- The capacity for work
As biologic work increases, energy transfer increases
As biologic work is expressed in mechanical units
Emerges only when a change takes place
Flow and energy exchange within a living system
First Law of Thermodynamics
Energy cannot be created or destroyed, but only transforms from one form to another w/o being depleted
An expression of the conversation of energy principle
-The body does not produce, consume or us up energy: it transforms from one state into the next as physiologic systems undergo continual change.
Potential & Kinetic Energy
PE-relates to structure or position. EX: Water at dam top
KE-energy of motion with release of heat.
Bound energy in one substance directly transfers to other substancs to increase their PE
Exergonic-Any physical or chemical process that releases energy to surroundings w free energy decline
Endergonic-Chem reactions that store/ absorb energy w free energy increase for biologic work
Transfer of PE always proceeds in a direction that decreases capacity to perform work
Second Law
Tendency of PE to degreade to KE of motion w a lower capacity of wotk
All PE in a system degrades to unusable form of KE or heat
TE in a system remains constant; a decrease in 1 energy form matches the equivalent energy increase in another form
Six Forms of Energy Interconversions
Chemical, Mechanical, Heat, Light, Electrical, Nuclear
Photosynthesis- Endergonic

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