Chapter 9- Energetics (Nov 17) Flashcards
bioenergetics=
energy and its metabolism by animals
animal nutrition is an ___-___ process
energy-converting
solar energy to food
energy is a ____, not a ____
property, not a nutrient
how does energy transfer?
through high energy bonds
- ATP & related compounds
give an example of a chemical –> heat transfer of energy
oxidation of fat, glucose, amino acids
give an example of chemical –> mechanical transfer of energy
muscle contraction
give an example of chemical –> electrical transfer of energy
glucose oxidation to electrical activity of brain
energy=
the ability to do work
what 2 things provide energy to animals?
- food
- stored energy (fat, protein, CHO)
calorie=
the heat required to raise the temp of 1g H2O from 16.5C to 17.5C
antoine lavoisier came up with
the idea of direct calorimetry
explain energy partitioning
Gross energy (GE) --> fecal energy loss
Digestible energy (DE) --> gaseous and urinary energy loss
Metabolizable Energy (ME) -->heat increment
Net energy (NE)
- -> used for maintenance (NEm)
- -> used for production (NEp)
gross energy=
the total heat of combustion (energy released from the breaking of all organic bonds in a sample)
T/F
gross energy has a relationship to feed digestibility
give ex
false
no relationship to feed digestibility
ex. eat the cheerios or the cereal box –> same energy, but you’re not going to digest as much of the box
how do you measure gross energy?
bomb calorimeter
