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 O 2 is consumed as glucose is broken down into CO 2 and H 2 O 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

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

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 foods-in-america-beware 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