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Cell Energy All cells need energy to live, grow, and reproduce. Plant cells get their energy from the sun Many animal cells get the energy they need from food
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Cell Energy
The Cell in Action
Cell Energy Why do you get hungry?
Feeling hungry is your body’s way of telling you that your cells need energy.
Cell EnergyAll cells need energy to live, grow, and reproduce.Plant cells get their energy from the sunMany animal cells get the energy they need from food
From sun to cell As you know, all energy webs and pyramids start with the sun.
Plants capture the energy of the sun and change it into food through a process called photosynthesis
The food that plants make supplies them with energy.
This food also becomes a source of energy for the organisms that eat the plants
Photosynthesis
Plants have molecules that absorb light energy.
These molecules are called pigments. Pigments give color
The main pigment used in photosynthesis is called chlorophyll. This give plants their green color
Chlorophyll is found in chloroplasts
PhotosynthesisPlants use the energy captured in the chlorophyll to change the carbon dioxide and water into food.This food is in the form of a simple sugar: glucoseWhen plants make glucose, they convert the sun’s energy into a form of energy that can be stored and used. Photosynthesis also produces oxygen!
Getting Energy from Foodhttp://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html
Animal cells have different ways of getting energy from food
The first way, cellular respiration, uses oxygen to break down food
The second way, fermentation, no oxygen is needed
Cellular Respiration is not breathing!!! The word “respiration” means “breathing”
But cellular respiration is different from breathing!
Breathing supplies the oxygen needed for cellular respiration
Breathing also removes carbon dioxide, which is the waste product of cellular respiration.
But cellular respiration is a chemical process that occurs in cells, not the mechanical process that occurs in your lungs
What cellular respiration is It is a chemical process where food (such as
glucose, a simple sugar) is broken down into carbon dioxide and water and energy is released
It is the opposite of photosynthesis.
It is used to make ATP by the mitochondrian, and maintain an animal’s body temperature.
A Symbiotic Relationship
Connection between Photosynthesis and Respiration…
Photosynthesis Cellular Respiration
Plants
Changes carbon dioxide to oxygen
Plants need the CO2 for photosynthesis
Animals
Changes oxygen to carbon dioxide
Animals need the O2 for respiration
FermentationHave you ever had a side stitch after running?
FermentationWhen your muscles can’t get the oxygen needed for cellular respiration, they use the process of fermentation for energy.
In fermentation, glucose molecules (sugars) are broken down, but oxygen is not used.
The waste products of fermentation are lactic acid, alcohol, and carbon dioxide.