Lecture 8 - Respiration
Dispersed as heat
Dispersed as light
Dispersed as ashes
Energy concentrated in wood
Energy dispersed as
heat and light
Stop iiiiiiTT!
Burning
glucose
Respiration
glucose
Energy =
heat & light
Energy =
heat & ATP
Metabolism – all chemical reactions in cell
Catabolism – breakdown of large to
smaller molecules
Anabolism – synthesis of larger molecules from
smaller molecules
Monomers
Anabolism
Catabolism
Polymer
Cell has a
constant
need for
energy
(ATP)
From Saunders Publ.
Adenosine triphosphate = ATP
A-P~P~P = ATP
High energy bond used to do work in cells
From Saunders College Publishing
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
Energy
Breaking of the 3rd bond will
liberate energy to do work in cells
Review
Respiration occurs in the mitochondrion
Oxidation and Reduction
Oxidation –
chemical reactions that
give up electrons
Oxidation and Reduction
A. Oxidation – chemical reactions
that give up electrons
B. Reduction – chemical reactions
that accept electrons
Reduction –
chemical reactions that
accept electrons
Oxidation and Reduction
Na+
oxidized
Na
(sodium)
e-
Let me at him
Cl
(chloride)
Cl
reduced
Heat
100oC
80oC
90oC
70oC
Review
60oC
50oC
“Hot”
(-)
4(-)
4 H atoms (from glucose) = 4 (+) and 4 (-)
Electron Transport System
= Oxidation and Reduction
4H+
Heat
ATP
2H2O
“cool”
+ O24-
O2 + 4(-)
Heat
100oC
80oC
90oC
70oC
Review
60oC
50oC
Glucose
Lactic Acid
w/o O2
+ O2
In muscles
Anaerobic metabolism – 2 ATPs
Fermentation in yeast
Ethanol and CO2
Aerobic metabolism 36 ATPs