Cellular Respiration - PowerPoint PPT Presentation

Loading...

PPT – Cellular Respiration PowerPoint presentation | free to download - id: 70cb30-NjU3Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Cellular Respiration

Description:

Cellular Respiration – PowerPoint PPT presentation

Number of Views:21
Avg rating:3.0/5.0
Slides: 31
Provided by: Michel437
Learn more at: http://static.schoolrack.com
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Cellular Respiration


1
(No Transcript)
2
Harvesting Chemical Energy
  • So we see how energy enters food chains (via
    autotrophs) we can look at how organisms use that
    energy to fuel their bodies.
  • Plants and animals both use products of
    photosynthesis (glucose) for metabolic fuel
  • Heterotrophs must take in energy from outside
    sources, cannot make their own e.g. animals
  • When we take in glucose (or other carbs),
    proteins, and fats-these foods dont come to us
    the way our cells can use them

3
Cellular Respiration
  • Cellular Respiration is the process that releases
    energy by breaking down food molecules in the
    presence of oxygen.
  • These reactions proceed the same way in plants
    and animals.
  • 6O2 C6H12O6 ? 6CO2 6H2O Energy
  • Oxygen Glucose ? Carbon Dioxide Water
    Energy

4
Cellular Respiration Overview
  • Breakdown of glucose begins in the cytoplasm
    the liquid matrix inside the cell
  • At this point life diverges into two forms and
    two pathways
  • Anaerobic cellular respiration (aka fermentation)
  • Aerobic cellular respiration

5
Chemical Pathways
Section 9-1
Glucose
Electrontransport
Krebs cycle
Glycolysis
Alcohol or lactic acid
Fermentation (without oxygen)
6
  • Glycolysis
  • Series of reactions which break the 6-carbon
    glucose molecule down into two 3-carbon molecules
    called pyruvate
  • Process is an ancient one-all organisms from
    simple bacteria to humans perform it the same way
  • Yields 2 ATP molecules for every one glucose
    molecule broken down
  • Yields 2 NADH per glucose molecule

7
(No Transcript)
8
Gylcolysis
9
Glycolysis
Section 9-1
Glucose
2 Pyruvic acid
To the electron transport chain
10
Fermentation
  • Releases energy from glucose without the presence
    of oxygen.
  • There are two types of fermentation alcoholic
    and lactic acid.
  • Alcoholic fermentation is done by yeasts and some
    microorganisms. It produces alcohol Carbon
    Dioxide
  • Lactic Acid is produced by muscles during rapid
    exercise when the body cannot supply enough
    oxygen.

11
Anaerobic Cellular Respiration
  • Some organisms thrive in environments with little
    or no oxygen
  • Marshes, bogs, gut of animals, sewage treatment
    ponds
  • No oxygen used anaerobic
  • Results in no more ATP, final steps in these
    pathways serve ONLY to regenerate NAD so it can
    return to pick up more electrons and hydrogens in
    glycolysis.
  • End products such as ethanol and CO2 (single cell
    fungi (yeast) in beer/bread) or lactic acid
    (muscle cells)

12
(No Transcript)
13
Lactic Acid Fermentation
Section 9-1
Glucose
Lactic acid
Pyruvic acid
14
Aerobic Cellular Respiration
  • Oxygen requiredaerobic
  • 2 more sets of reactions which occur in a
    specialized structure within the cell called the
    mitochondria
  • 1. Krebs Cycle
  • 2. Electron Transport Chain

15
Aerobic Cellular Respiration
Section 9-2
Glucose(C6H1206) Oxygen(02)
Glycolysis
KrebsCycle
ElectronTransportChain
Carbon Dioxide (CO2) Water (H2O)
16
 Cellular Respiration An Overview
Section 9-1
Mitochondrion
Electrons carried in NADH
Electrons carried in NADH and FADH2
Pyruvic acid
Glucose
Electron Transport Chain
Krebs Cycle
Glycolysis
Mitochondrion
Cytoplasm
17
Aerobic Cellular Respiration
  • Oxygen requiredaerobic
  • occur in a specialized structure within the cell
    called the mitochondria
  • 1. Krebs Cycle
  • 2. Electron Transport Chain

18
The Krebs Cycle
  • During the Krebs Cycle, pyruvic acid is broken
    down into carbon dioxide in a series of
    energy-extracting reactions.
  • Citric Acid is created in this cycle thus giving
    it the nickname Citric Acid cycle.
  • Net ATP Production is 2 ATP.

19
(No Transcript)
20
Krebs Cycle
  • Completes the breakdown of glucose
  • Takes the pyruvate (3-carbons) and breaks it
    down, the carbon and oxygen atoms end up in CO2
    and H2O
  • Hydrogens and electrons are stripped and loaded
    onto NAD and FAD to produce NADH and FADH2
  • Production of only 2 more ATP but loads up the
    coenzymes with H and electrons which move to the
    3rd stage

21
The Krebs Cycle
Section 9-2
Citric Acid Production
Mitochondrion
22
Electron Transport Chain
  • The electron transport chain uses the high-energy
    electrons from the Krebs Cycle to convert ADP to
    ATP.
  • Total ATP 32.

23
Electron Transport Chain
  • Electron carriers loaded with electrons and
    protons from the Krebs cycle move to this
    chain-like a series of steps (staircase).
  • As electrons drop down stairs, energy released to
    form a total of 32 ATP
  • Oxygen waits at bottom of staircase, picks up
    electrons and protons and in doing so becomes
    water

24
 Electron Transport Chain
Section 9-2
Electron Transport
Hydrogen Ion Movement
Channel
Mitochondrion
Intermembrane Space
ATP synthase
Inner Membrane
Matrix
ATP Production
25
(No Transcript)
26
Energy Tally
  • 36 ATP for aerobic vs. 2 ATP for anaerobic
  • Glycolysis 2 ATP
  • Krebs 2 ATP
  • Electron Transport 32 ATP
  • 36 ATP
  • Anaerobic organisms cant be too energetic but
    are important for global recycling of carbon

27
(No Transcript)
28
(No Transcript)
29
Energy Exercise
  • Quick energy Lactic Acid fermentation is used
    to get quick energy and gives off lactic acid as
    a by product, thus the muscle pain.
  • Long-Term Energy Use cellular respiration to
    produce energy. Exercising or activities that
    last for at least 15 to 20 minutes. Best form for
    weight control.

30
Comparing Photosynthesis Respiration
Photosynthesis Cellular Respiration
Function Energy Storage Energy Release
Location Chloroplasts Mitochondria
Reactants CO2 and H2O C6H12O6 and O2
Products C6H12O6 and O2 CO2 and H2O
Equation 6CO2 6H2O ? C6H12O6 6O2 C6H12O6 6O2? 6CO2 6H2O
About PowerShow.com