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?