Energy and Life
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Slide 1 - Energy and Life
Slide 2 - Review
- Each part of the cell is responsible for a specific job:
- Cell membrane: TRANSPORT (diffusion, osmosis, facilitated diffusion, active transport)
- Mitochondria: CELLULAR RESPIRATION
- Chloroplasts: Photosynthesis
Slide 3 - METABOLISM
- All living things have a metabolism. METABOLISM is the process of converting food into energy.
- The energy in food is measured in CALORIES.
- Certain foods (like fats) are higher in calories and therefore contain more energy
- Calories not used are stored
Slide 4 - Site of Metabolism
- In eukaryotic cells, most metabolism occurs in the mitochondria.
Slide 5 - PROBLEM:
- Your body cannot use energy from food directly!
- Too much energy would be released at once
Slide 6 - ATP
- ATP is the only useable form of energy for living things.
- Energy from the food we eat must be converted (or changed) into ATP.
- ATP is like a fully-charged battery. As it loses its charge, it is chemically changed into another chemical called ADP.
Slide 7 - Battery Analogy:
Slide 8 - ATP-ADP Cycle
Slide 9 - CELLULAR RESPIRATION
- Cellular respiration is the process that living things use to convert glucose (a sugar) into useable energy: ATP!
Slide 10 - REACTANTS (things needed)
- Glucose (C6H12O6)…
- Comes from carbohydrates
- Oxygen (O2)…..
- Comes from the air (breathing)
Slide 11 - PRODUCTS (things made)
- used for energy!
- Carbon dioxide (CO2)…
- exhaled as waste
- Water (H2O)…
- exhaled or excreted as waste
Slide 12 - OVERALL EQUATION FOR CELLULAR RESPIRATION: