Regents Biology A Slideshow Presentation © 2008 DaveCo. inc. All rights reserved

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