Introduction to Cellular Respiration

Introduction To Cellular Respiration

• How did you get the energy to get ready this morning?

• Where did you get your energy?

• What had to happen within you for you to get energy?

Introduction To Cellular Respiration

• The energy that you use for your daily processes is harvested by cellular respiration

• In cellular respiration O2 is consumed as glucose is broken down into CO2 and H2O and the cell captures that energy as ATP

Introduction To Cellular Respiration

• Cellular respiration has a set chemical reaction

• Just like photosynthesis there is a set pathway with set inputs and products

Introduction To Cellular Respiration

Introduction To Cellular Respiration

• What does this equations remind you of?

• Photosynthesis and CR are linked

• The products for photosynthesis are the reactants for CR

• The products for CR are the reactants for photosynthesis

Introduction To Cellular Respiration

Introduction To Cellular Respiration

• All cells break down molecules for energy

• Both autotrophs and heterotrophs create chemical energy from food

• Heterotrophs break down food that has been consumed

• Autotrophs break down food that they have produced

Stages of Cellular Respiration

• Cellular Respiration happens in stages

• Very similar to photosynthesis, there are stages to cellular respiration– Glycolysis– Anaerobic cellular

respiration– Aerobic cellular

respiration

Stages of Cellular Respiration

• Glycolysis happens first and will happen every time cellular respiration starts

• After that there are two different pathways that could be followed

• Aerobic respiration requires oxygen

• Anaerobic respiration does not require oxygen

The Mighty Mitochondria

• Think back to cell as a city• What job did we give the

mitochondria?• The mitochondria has

two main areas• The matrix is the inner

space filled with fluid • The inner membrane is a

folded membrane on the inside the mitochondria

The Mighty Mitochondria

• The aerobic parts of cellular respiration are performed in the mitochondria

• Every part of cellular respiration that involves oxygen is done in the mitochondria

The Mighty Mitochondria

• Glycolysis happens in the cytoplasm

• The Krebs Cycle “Citrus Acid Cycle” happens in the matrix

• The process of oxidative phosphorylation happens in the inner mitochondria membrane

Other Information

• Cellular respiration is an exergonic process

• This means it gives off energy

• The energy that it gives off can be measured

• We measure its energy in calories or kilocalories

Other Information

• A calorie is the ability for a unit of energy to heat one gram (one mL) of water one degree Celsius

• A kilocalorie is the ability heat one kilogram of water (one L) one degree Celsius

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2,500,000 Liters

Other Information

• Cellular respiration is not an exact process

• It can only harvest around 34% of the energy in a molecule of glucose

• Everything else is lost as heat