Cellular Respiration DCS 2017 Edit

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Biology Cell Respiration ,


Every organism is affected by the things in its environment.


Target I can describe Cellular Respiration and explain how Glucose Is converted into useable energy.


We don’t get energy from the sun…


So…How does your body get energy?


Eating ! When we eat, our food is broken down in our bodies to get energy out of it.


What is energy ? the ability to do work


The energy obtained from carbohydrates , proteins , & fats is measured in units of heat called … CALORIES How is energy measured?

Energy is like a fire...:

Energy is like a fire... This is why we eat FOOD Fire requires 2 main ingredients: 1. FUEL 2. OXYGEN This is why we breathe


Our energy-making process depends on the breathing system and the digestive system . This is why we eat and breathe .

Comparing respiration and combustion:

When something burns, heat and light energy are released and carbon dioxide and water are produced, so combustion is similar to respiration. Except… Fire is the reaction between a fuel and oxygen… it’s called combustion - Comparing respiration and combustion carbon dioxide fuel oxygen water Respiration is a CONTROLLED REACTION which slowly releases energy from food in the body’s cells and the cells do not catch fire!


What types of organisms undergo cellular respiration? Cellular respiration occurs in ALL living cells!


Cellular Respiration Cellular respiration is a chemical process in which GLUCOSE molecules are broken down to an ENERGY source cells can use:


ATP = A denosine T ri p hosphate One big Energy molecule that is made of 5 smaller molecules bonded together.


What happens to the food we eat? 1. We break our food down into small molecules 2. We use the energy stored in the bonds in our food to make ATP 3. A small amount of the food becomes waste


Cellular Respiration is a chemical reaction - During chemical reactions, molecules break apart and rearrange to make new molecules.


Like photosynthesis, cellular respiration has a specific chemical reaction that happens every time . O 2 + C 6 H 12 O 6  CO 2 + H 2 O + Energy (ATP) We breathe in oxygen and get glucose from our food We breathe out carbon dioxide and water +  (reactants) (products)


Wait a sec- I don’t breath out water do I? Yup- You do.

What is respiration?:

from the digestive system from the breathing system useful! waste product exhaled waste product exhaled Respiration is the process that the body uses to release energy from digested food (glucose): What is respiration? carbon dioxide glucose oxygen water energy


Glucose is SUGAR & sugar is FOOD . Cell Respiration


Organisms that cannot make their own food, are called heterotrophs , which means “other-feeders” They eat plants ( autotrophs) or other heterotrophs and convert sugar into energy Some heterotrophs, consuming some autotrophs Cell Respiration


Plants and animals typically depend on each other as part of a GREAT CIRCLE Cell Respiration


The Great Circle In the film “The Lion King” Mufasa explains to his son Simba how all living things are connected: Antelopes eat the grass, lions eat antelopes , but when the lions die, their bodies become food for the grass, and so the ‘circle of life’ goes on…. “ The Lion King” and its associated characters are the property of Walt Disney Pictures, Incorporated.


One part of the circle, Cell Respiration , occurs in heterotrophs and autotrophs Another part, Photosynthesis , occurs in autotrophs Cell Respiration , : part of The Great Circle


can be summarized with a simple equation: C 6 H 12 O 6 + O 2  CO 2 + H 2 O + Energy (ATP) . Cell Respiration Does it look Familiar? It’s the opposite of Photosynthesis


PHOTOSYNTHESIS Sugars like glucose can be thought of as $1-dollar ‘bill’ of energy!


Cell Respiration Sugars ( glucose ) are broken down into useable forms of energy called…


Analogy for ATP: ATP molecules are like coins : handy for small amounts of ‘money’ ( energy ), but not practical when lots of ‘cash’ is needed. A T P


You go to the laundromat with a $100 bill But- laundry machines don’t take $100 bills . What do you need to do? You need to break the $100 and get change… The Human Body is like… ATP and ENERGY-The Laundromat Analogy:


Let’s break that $100 $100 $1 Stored Fat Glucose Quarter

$100 = Stored Fat:

$100 = Stored Fat Fat is the energy source for rest and prolonged activity at lower levels of exertion. Breaking down fat is a SLOW process. Just as getting change for the $100 bill may be take a while, using fat to meet cellular energy demands takes longer than using glucose and ATP .

$1 = glucose:

$1 = glucose Glucose is like having dollar bills that can be broken down to quarters in a change machine. Can carry more $1 bills than quarters. The human body stores enough glucose for short amounts of energy- not enough to sustain long duration of exercise or a period of time without food.

Quarters = ATP:

Quarters = ATP Immediate energy source (ATP) The amount of ATP stored is very limited. Provides short bursts of energy for 8-12 seconds of intense exercise.


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