regents biology a slideshow presentation © 2008 daveco. inc. all rights reserved
TRANSCRIPT
Regents Biology A
Slideshow Presentation
© 2008 DaveCo. inc. All rights reserved.
CellularRespiration
Overview
Given: Cells need energy.Given: Food contains energy.
Prove: How cells get the energy out of food into a usable form.
Overview
What kind of energy is in food?
Chemical EnergyKinetic Energy
Overview
What kind of energy do cells use?
Chemical Energy – ATP
Problem
Convert
Into
Solution
Slowly break down food molecules, and convert the energy in their bonds into energy that can make ATP.
GlycolysisKrebs Cycle
Electron Transport Chain
The Trifecta
The Big PictureGlycolysis:
Break apart glucose
Krebs Cycle:Pluck electrons from glucose
leftovers
Electron Transport Chain:Make proton gradient
GlycolysisP P
-1-2
Pyruvate + 2 ATP + 2
2
NADH
Krebs Cycle
2 ATP8 NADH2 FADH2
MostlyReducedCompounds
E.T.C.
E.T.C.
H+
H+H+
H+ H+
H+
H+
H+
H+H+
H+H+
H+
ATP SynthaseIntermembraneSpace
Matrix
H+
H+H+ H+
H+H+
H+
ATP!
Why Oxygen?•Most electronegative.
•Without it, the entire system backs up like an assembly line.
•Create water at the end – an actual source of water for some creatures.
Summary
Glycolysis:
Krebs:
ETC:
2 ATP 2 NADH
2 ATP 8 NADH 2 FADH2
34 ATP
38 ATP + H2O +CO2
Summary
Why all the rigmarole?
Release the energy slowly tocontrol where it goes.
Still not efficient – body heatis evidence.
Resources
Respiration Resources
Extension Resources