Cellular Respiration Harvesting Chemical Energy ATP 2009-2010

“Burn fuels” to make energy CO2 + H2O + heat fuel (carbohydrates) O2 cellular respiration making ATP energy (& some heat) by burning fuels in many small steps Movement of hydrogen atoms from glucose to water ATP food (carbohydrates) O2 ATP + CO2 + H2O (+ heat)

Animals are energy consumers. What do we need energy for? synthesis (building for growth) reproduction active transport movement temperature control (making heat) Which is to say… if you don’t eat, you die… because you run out of energy. The 2nd Law of Thermodynamics takes over!

Where do we get energy? ATP Energy is stored in organic molecules carbohydrates, lipids, proteins Animals eat these organic molecules  food digest food to get fuels for energy (ATP) raw materials for building more molecules ATP We eat to take in the fuels to make ATP which will then be used to help us build biomolecules and grow and move and… live! heterotrophs = “fed by others” vs. autotrophs = “self-feeders”

Adenosine TriPhosphate What is energy in biology? ATP Adenosine TriPhosphate 2009-201

Harvesting energy stored in food Cellular respiration breaking down food to produce ATP in mitochondria using oxygen aerobic usually digesting glucose ATP food O2 Movement of hydrogen atoms from glucose to water

Where does cellular respiration take place? animal cells plant cells