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  • Cellular Respiration Overview

    April 1, 2013

  • Learning Targets

    • Students will be able to explain where

    organisms get the energy they need for life

    processes.

    • Students will be able to define cellular

    respiration.

    • Students will be able to compare

    photosynthesis and cellular respiration.

  • Bell Work

    • Watch the Chapter Mystery video on page 431

    at the beginning of Chapter 9.

    • What adaptations do you think whales have

    that allow them to go so long without

    breathing?

  • Where do organisms get energy?

    • Autotrophs – make their own food through photosynthesis.

    • Heterotrophs – must consume other organisms for food.

    • Food molecules contain chemical energy that is released when chemical bonds are broken.

  • Energy in food

    • How much energy is in food?

    • Varies with the type of food. – Depends on chemical

    structure

    • Energy in food is described in units of calories. – Amount of energy

    needed to raise the temperature of 1 gram of water 1 degree Celsius.

  • Cells and Food Energy

    • Cells break down food slowly, capturing

    chemical energy at key steps

    • Cellular respiration is the process that

    releases energy from food in the presence of

    oxygen.

  • Cellular Respiration

    • Overall reaction for cellular respiration

    • Requires oxygen and food (such as glucose)

  • Cellular Respiration

    • Happens in a series of steps to control the

    energy being released from the food.

    • Energy from the reactions is stored as ATP.

  • Writing Break

    • Do plants undergo cellular respiration? What

    organelle(s) do they have that helps you

    determine the answer?

  • Stages of Cellular Respiration

    • Three main stages: – Glycolysis

    – Krebs cycle

    – Electron transport chain

    • Most of the energy comes from the electron transport chain

  • Oxygen and Energy

    • Oxygen is a powerful electron acceptor.

    • Aerobic processes – require oxygen, such as Krebs cycle and the electron transport chain.

    • Anaerobic processes – do not require oxygen, such as glycolysis

    • In the absence of oxygen, fermentation keeps glycolysis going to provide ATP for cellular activity

  • Mitochondria

    • Mitochondria are organelles that convert

    chemical energy in food to usable energy for

    the cell.

    • Glycolysis generally occurs in the cytoplasm,

    but the Krebs cycle and the electron transport

    chain take place inside the mitochondria.

  • Writing Break

    • Make a flowchart that shows the different

    steps of cellular respiration.

    • Chapter mystery clue – If whales remain

    underwater for 45 minutes or more, do you

    think they rely primarily on aerobic or

    anaerobic pathways?

  • Photosynthesis and Cellular Respiration

    • Photosynthesis removes CO2 from the air and cellular respiration puts it back. Photosynthesis releases O2 into the atmosphere and cellular respiration uses that oxygen to release energy from food.

  • Assessment

    • Questions:

    – Why do food molecules differ in the amount of energy they contain?

    – Write the overall reaction for cellular respiration.

    – In what ways are cellular respiration and photosynthesis considered opposite processes?

    – The Greek word glukus means “sweet” and the Latin word lysis refers to a process of loosening or decomposing. Based on this information, write a definition for the word glycolysis.

    • Analyzing Data activity – page 433 “You are what you eat”