Energy concentrated in wood

Dispersed as heat

Dispersed as light

Dispersed as ashes

Lecture 8 - Respiration

Energy dispersed as heat and light

glucose

Energy = heat & light

Stop iiiiiiTT!

glucose

RespirationBurning

Energy = heat & ATP

Metabolism – all chemical reactions in cell

Catabolism – breakdown of large to smaller molecules

Anabolism – synthesis of larger molecules from smaller molecules

Anabolism Catabolism

Monomers

Polymer

From Saunders Publ.

Cell has a constant need for energy (ATP)

From Saunders College Publishing

High energy bond used to do work in cells

A-P~P~P = ATP

Adenosine triphosphate = ATP

Average adult human produces and utilizes her/his own body weight of ATP per day.

Price of ATP from Sigma Chemical Company is $20.00 per gram

For 70 kg (131) individual it would cost $1,400,000 to purchase that amount of ATP for one day’s worth of ATP

Cell has 1 second supply of ATP

10,000,000 ATPs used and made per second per cell

Cellular Respiration (Aerobic breakdown of glucose)

Glucose, C6H12O6 + O2

CO2 + H2O + 36 (net) ATPs + Heat

Respiration releases energy in chemical bonds in glucose

Enough energy for 36 ATPs

Glucose

Now what??

A-P~P~P

Breaking of the 3rd bond will liberate energy to do work in cells

Energy

Respiration occurs in the mitochondrionReview

Oxidation and ReductionA. Oxidation – chemical reactions that give up electronsB. Reduction – chemical reactions that accept electrons

Oxidation and Reduction

Oxidation –

chemical reactions that give up electrons

Reduction –

chemical reactions that accept electrons

NaNa+

e-

Cl

Cl-

oxidized

reduced

(sodium)

(chloride)

Let me at him

Oxidation and Reduction

Heat

90oC80oC

70oC

60oC

50oC

Review

100oC

(-) 4(-)

4H+

O2 4(-)+O24-

2H2O

+

Electron Transport System = Oxidation and

Reduction

Heat

ATP

4 H atoms (from glucose) = 4 (+) and 4 (-)“Hot”

“cool”

Heat

90oC80oC

70oC

60oC

50oC

Review

100oC

Lactic Acid

Ethanol and CO2

w/o O2

In muscles

Fermentation in yeast

+ O2

Aerobic metabolism 36 ATPs

Glucose

Anaerobic metabolism – 2 ATPs