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Phys Adapt
Chapter 5
22
Biology
Undergraduate 4
09/20/2007

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Term
Second law of thermodynamics
Definition
if an isolated system undergoes internal change, the direction of the change is always toward greater disorder
Term
Energy
Definition
capacity to do mechanical work, measured as the product of force and distance.
Term
Chemical energy
Definition
energy liberated or required when atoms are rearranged into new configurations
Term
Electrical energy
Definition
energy that a system possesses by virtue of the separation of positive and negative electrical charges.
Term
Mechanical energy
Definition
energy of organized motion in which many molecules move simultaneously in the some direction
Term
Heat
Definition
energy of random atomic molecular motion
Term
Physiological work
Definition
any process carried out by an animal that increases order.
Term
High-grade energy
Definition
can do physiological work; chemical, electrical, and mechanical energy
Term
Low-grade energy
Definition
- cannot do physiological work; heat
Term
Ingested chemical energy
Definition
energy present in the chemical bonds of an animal’s food
Term
Fecal chemical energy
Definition
egested chemical bond energy
Term
Absorbed chemical energy
Definition
energy available for the performance of physiological work by the animal’s cells.
Term
Maintenance
Definition
processes that maintain the integrity of its body; circulation, respiration, etc.
Term
Internal work
Definition
mechanical work that takes place inside an animal’s body
Term
External work
Definition
application of mechanical forces to objects outside their bodies.
Term
Metabolic rate
Definition
rate of energy consumption: rate at which it converts chemical energy to heat and external work.
Term
Direct calorimeter
Definition
device that measures the rate at which heat leaves an animals body.
Term
Indirect calorimetry
Definition
measures an animal’s metabolic rate by means other than quantifying heat and work.
Term
Material balance
Definition
measure chemical-energy content of organic material entering and leaving an animal’s body
Term
Basal metabolic rate (BMR)
Definition
standardized measure of metabolic rate that applies to homeotherms within which the metabolic rate is minimal.
Term
Standard metabolic rate (SMR)
Definition
applies to poikilotherms, metabolic rate while it is fasting or resting.
Term
Fasting
Definition
subject’s last meal took place long enough ago for the SDA of the meal to be over.
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