Download Cell Respiration

Cellular Respiration
Releasing Chemical Energy
December
1. Warm-up #1 due now
2. Cell Respiration
notes
3. Activity
th
8
Capture- take into one's
possession or control by
force.
Product -a chemical
substance formed as a
result of a chemical
reaction
Introduction
• All organisms must have energy
to carry out life processes.
• So where does this energy come
from?
I. Cellular Respiration
•
DEFINITION: The breakdown of glucose
to release energy (ATP) for the cell to do
work.
•
Energy is stored
during
photosynthesis.
•
Energy is released
during
cellular respiration.
• Cellular respiration occurs in the cells of
both autotrophs (plants) and heterotrophs
(animals).
• Cellular respiration takes place in the
mitochondria.
Animal
Cell
Plant
Cell
• Cristae are the internal compartments formed
by the inner membrane of a mitochondrion.
• They increase the surface area and help the
mitochondria to function very efficiently.
II. Types of Cellular
Respiration
• There are two types of cellular
respiration:
–
AEROBIC – with oxygen
–
ANAEROBIC – without oxygen
A. Aerobic Respiration – with
oxygen
1. Glycolysis – breakdown of a glucose
molecule into 2 pyruvic acids, NADH
& ATP in the cytoplasm
2. Krebs Cycle – occurs in the
mitochondria
3. Electron Transport Chain – occurs in
the mitochondria; more ATP is
produced
4. One molecule of glucose produces 36
molecules of ATP
Chemical equation for aerobic
respiration
C6H12O6 + 6O2
glucose
6CO2 + 6H2O + ATP
+ oxygen yields carbon +
dioxide
water + energy
B. Anaerobic Respiration –
without oxygen
1. Glycolysis – breakdown of glucose into
two pyruvic acids
2. Fermentation occurs if the process
continues without oxygen
a. Alcoholic fermentation in yeasts and
bacteria produces ethyl alcohol, CO2 & 2
ATP
– Used in baking bread and making beer
and wine
b. Lactic acid fermentation in animals
produces lactic acid & 2 ATP; causes
muscle soreness during heavy exercise
III. Comparing Photosynthesis
& Cellular Respiration
Photosynthesis
Cellular Respiration
Function
Energy storage
Energy release
Location
Chloroplasts
Mitochondria
Reactants CO2 and H2O
Products
C6H12O6 and O2
C6H12O6 and O2
CO2 and H2O
Notice that the products of photosynthesis are the
reactants of cellular respiration.
And the products of cellular respiration are the reactants
of photosynthesis.
Photosynthesis
Cellular
Respiration