Cell Energy Ch4.2 7th PDF
Transcript of Cell Energy Ch4.2 7th PDF
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Chapter 4 Section 2
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Describe photosynthesis and cellularrespiration
Compare cellular respiration with fermentation
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All cells need energy to live, grow, andreproduce
Plant cells get energy from the sun
Animal cells get the energy they need fromfood
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Plants capture energy from the sun and changeit into food through a process called:photosynthesis
The food that the plants make supplies themwith energy
This food is a source of energy for organismsthat eat plants
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http://grapevine.net.au/~grunwald/une/KLAs/science/irrigation-photosynthesis.gif
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Definition:
The process by which plants, algae, and somebacteria use sunlight, carbon dioxide, and water tomake food
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Molecules in plant cells that absorb lightenergy: pigments
Chlorophyll = pigment used in photosynthesis Gives plants their green color
Found in chloroplasts
http://www.usoe.k12.ut.us/CURR/science/sciber00/8th/energy/images/chloro.jpg
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Plants use energy captured by chlorophyll tochange CO2 and H2O into food
Food is in the form of glucose (a simple sugar –carbohydrate)
Glucose is used by the plants cells as storedenergy
Oxygen is produced
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Animals use:
Cellular Respiration: using oxygen to break down
food
Fermentation: breakdown of food without oxygen
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A chemical process that occurs in cells
Food (glucose) is broken down into CO2 andH2O and energy is released
In animals, energy maintains body temperatureor forms ATP
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In prokaryotic cells:
Takes place in the cell membrane
In eukaryotic cells:
Takes place in the mitochondria
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http://www.rogers.k12.ar.us/users/ehutches/image150.gif
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Each process makes materials that are needed forthe other process to occur
Photosynthesis
uses CO2
makes glucose
releases oxygen
Cellular Respiration uses oxygen
breaks down glucose
releases CO2
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When your cells can’t get the oxygen they needfor cellular respiration
Ex: Muscles – lactic acid production
Ex: Bacteria - yogurt
Ex: Yeasts – causes dough to rise
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