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Cellular Respiration
Introduction and Overview
She’s
getting
energy
from her
food!
As always…
Key concepts are underlined
Vocabulary terms are in green
In this lesson you will learn to:
1. Write the equation for respiration in symbols and words
2. Identify the stages of aerobic cellular respiration and the reactants and products for each stage
On your whiteboards
What are some things you feel when you have not eaten in a long time?
Energy for CellsEnergy for Cells
We get energy We get energy from our foodfrom our food
One gram of One gram of glucose releases glucose releases 3811 calories of 3811 calories of energyenergy
Draw this
To make ATP we need 2* things
1. Glucose – from food
2. Oxygen*1. Organisms can make a little ATP without O2
https://www.youtube.com/watch?v=x8oLu7znwQ0
●Cellular Respiration = process that cells use to release the energy from glucose and store it in molecules of ATP
On your whiteboards
What is the chemical symbol for:
OxygenWaterCarbon dioxideGlucose
Respiration Equation:
What are the reactants in this equation? What are the products in this equation?
We need lots of ATP to run this fast!
Taller partner: How are the equations for photosynthesis and cellular respiration related to each other?
Shorter partner: How are they similar? How are they different?
Autotroph or Heterotroph?
C6H12O6
ATP
Light energy
Chemical (food) energy
Chemical energy
Breaking chemical bonds in sugar Breaking chemical bonds in sugar releases energyreleases energy
That energy isThat energy is stored instored in molecules of molecules of ATPATP
On your whiteboards
What is RELEASED when chemical bonds are broken?
So…what is STORED in chemical bonds?
There are 3 stages to aerobic cellular respiration
How Cells Make ATP
Glucose
Glycolysis
O2 Present O2 Absent
Broken glucose goes to mitochondria
Mitochondria makes lots of ATP
Fermentation
Alcohol Lactic Acid
How do cells get the energy out of glucose? – Stage 1 GlycolysisGlycolysis
Cells take in glucose and break it in half - this is glycolysis
This releases some energy
2 ATP are made
energy!
If no OIf no O22 anaerobic respirationanaerobic respiration
Only 2 ATP madeThis process is also called
fermentation
2 Types of Fermentation
Alcohol FermentationYeast and bacteria
do thisProduces alcohol
as a by product
Lactic Acid Fermentation Occurs in muscle cells, yeast, bacteria Produces lactic acid – yogurt, cheese, burning
pain in muscles
Partner and Class Discussion
Do all living things require oxygen?
How is it that some organisms, like bacteria and yeast, can survive only making 2 ATP for each sugar molecule they consume?
If O2 is available aerobic respiration!aerobic respiration!
Sugar molecules sent to mitochondria 36 ATP made
36 ATP!
2 ATP36 ATP!
Stage 2 Citric Acid Cycle (aka Kreb's cycle)
happens in the matrix
Reactant: ½ sugar
Products: 2 ATP, CO2, electron carrier NADH
Mitochondria Electron
Transport Chain
happens on the cristae
Reactants: O2, NADH
Products: H2O, 34-36 ATP
Comparing Photosynthesis and Comparing Photosynthesis and Cellular RespirationCellular Respiration
Photosynthesis vs. Cellular RespirationPhotosynthesis vs. Cellular Respiration
PhotosynthesisPhotosynthesis Cellular RespirationCellular Respiration
FunctionFunction Energy storage by Energy storage by making glucosemaking glucose
Energy release by Energy release by breaking down breaking down glucoseglucose
LocationLocation ChloroplastsChloroplasts MitochondriaMitochondria
ReactantsReactants COCO22 and H and H22OO CC66HH1212OO66 and O and O22
ProductsProducts CC66HH1212OO66 and O and O22 COCO22 and H and H22OO
EquationEquation COCO22 + H + H220 C0 C66HH1212OO66 + O + O22 OO22 + C + C66HH1212OO66 CO CO22 + H + H22OO
So can you…
1. Write the equation for respiration in symbols and words?
2. Name the 3 stages of aerobic cellular respiration and the reactants and products for each stage?
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