cellular respiration ln #11 cell biology 1g. the role of the mitochondria in making stored...
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Cellular Respiration
LN #11
Cell Biology1g. the role of the mitochondria in making stored chemical-bond energy
available to cells by completing the breakdown of glucose to carbon dioxide.
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Energy Flow
• The energy needed for life to exist comes from the sun.
• Before the sun’s energy can be used by cells it needs to be turned into ATP.
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Sun light to ATP
• Light energy is captured by the chloroplast.
• Photosynthesis converts the light energy into glucose (sugar).
• Glucose is broken down into ATP in a process called cellular respiration.
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Cellular respiration
• The formula for cellular respiration is– C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP
• Cellular respiration takes place in the cytoplasm and mitochondria of cells.
• Cellular respiration produces 38 ATP molecules for every glucose molecule.
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The 3 parts of cellular respiration
• The first part is called glycolysis and it occurs in the cytoplasm.
• The second and third part are called the Krebs cycle and Electron transport chain they both occur in the mitochondria.
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Cellular Respiration & Muscles
• In order for cellular respiration to take place oxygen is needed.
• Oxygen is delivered to cells by breathing.
• Carbon dioxide is a waste product of cellular respiration.
• You remove carbon dioxide from your body by breathing.
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When there is no Oxygen
• There are times when your cells run out of oxygen, like during difficult exercise.
• Your cells still need a way to get energy.• Lactic acid fermentation supplies energy when
oxygen is low.
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Lactic Acid Fermentation
• Lactic acid fermentation gives you 2 ATPs for every glucose.– Cellular respiration gives
38 ATPs
• Lactate is the waste product of lactic acid fermentation.
• The collection of lactate is the cause of muscle soreness.
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Summary
• What needs to happen to light energy before your cells can use it?
• What organelle captures the energy from the sun?
• What is cellular respiration?• Where does cellular respiration take
place?• What is lactic acid fermentation? When
does it occur?
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CytoplasmMitochondria