Biology 2601A/B Lecture Notes - Telecom Regulatory Authority Of India, Perpetual Motion, Yo Momma

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9 Nov 2012
Org Phys Lect
Sept 20
Energy: The capacity to do work
A wave is not an object coming toward you, it is energy moving through the surface
of the ocean as a wave
Metabolism is the entire process
Energy Metabolism:
2 categories; one where you destroy things (catabolic) one where you build things
Law of thermodynamics
First law: energy cannot be created or destroyed, it can only change forms (idea that
its conserved)
- sitting on the beach and you see a wave hit the beach, where has the energy
gone? Heat and sound (nrg gets changed in terms of its form)
second law: entropy (randomness) always increases
claw pic
energy has a capacity to increase order
why is energy so important to organisms
you have to eat all the time
why do we always need energy?
We need it to maintain our body temperature and to keep organized
Pics are the development of a sea star (sea urchin), when you grow and you undergo
your organized process you come to your adult stage
Our bodies are always changing, the atoms are constantly being exchanged with our
environments (our red blood cells die every 4 days and then are replaced), every
atom in our bodies are being replaced at some rate
This is what takes a considerable amount of energy
Star fish page
When you die your energy is all taken away from you, the entropy of your atoms go
into the earth
Animals are not isolated systems, they need energy from the outside world, we are
not static (like the perpetual motion machine) we need some kind of input.
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