Catabolism Anabolism

Metabolism

First Law of ThermodynamicsEating

Where does the energy come from?

Where does it go?

First Law of Thermodynamics

Walking up a hillWhere does the

energy come from?Where does it go?

Sledding down a hillWhere does the

energy come from?Where does it go?

Has energy been created or destroyed?

First law of thermodynamicsEnergy cannot be created or destroyed

Second law of thermodynamicsEnergy transfer is not completely efficient,

therefore…Every energy transfer or transformation

increases the entropy of the universeEntropy – Disorder or randomness

Second law of thermodynamicsNeed energy to

decrease entropyEx. Cleaning your

roomDo not need

energy to increase entropy (Spontaneously)Ex. Your room gets

messy without work

Energy and reactionsEnergy – the

capacity to do workWork = force x

distance moved

Energy and reactionsWhat is the unit on

the y axis? Energy (Gibbs free

energy)Which graph

represents more capacity to do work?

Energy and Reactions

Exergonic and Endergonic reactions

Why is this important?The cells use exergonic processes to drive

endergonic processes.This is called energy coupling

Think of a real life example of a primary action

that stores potential energy for a secondary action. (ex: pumping water into a holding tank then allowing it to flow through a turbine when electricity is needed)

ATP!!!!ATP couples

reactions within the cell

What do you think regenerates ATP?

Catabolism!!!! (cellular respiration)