Cell Energy - PowerPoint PPT Presentation

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Cell Energy

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Cell Energy Chapter 2 Section 2 Why do cells need energy? Live Grow Reproduce From Sun to Cell The sun provides energy for almost all living things. – PowerPoint PPT presentation

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Title: Cell Energy


1
Cell Energy
  • Chapter 2 Section 2

2
Why do cells need energy?
  • Live
  • Grow
  • Reproduce

3
From Sun to Cell
  • The sun provides energy for almost all living
    things.
  • Plants capture light energy from the sun and
    change it into food through photosynthesis.
  • Once this food is converted into energy it is
    passed on to the organisms that eat it.

4
Food Web
Producers
Carnivores
Herbivores
5
Photosynthesis
  • In the chloroplasts of plant cells there is a
    green pigment called chlorophyll which absorbs
    the energy of light.
  • Plants use the energy captured by chlorophyll to
    change carbon dioxide (CO2) and water (H2O) into
    food, the simple sugar glucose (C6H12O6) and
    oxygen (O2).
  • When plants make glucose, they are converting the
    suns energy into a form of energy that can be
    stored.

6
Photosynthesis
  • 6 CO2 6 H2O light energy C6H12O6 6 O2

Carbon Dioxide
Water
Oxygen
Glucose
7
Getting Energy from Food
  • After you eat, your body must break down the food
    into a form that your cells can use.
  • This can be done in 2 ways
  • Cellular Respiration
  • Fermentation

8
Cellular Respiration
  • Cellular respiration uses oxygen and is a process
    your body uses to obtain energy from food.
  • Cellular respiration occurs in the mitochondria.
  • During cellular respiration, food (glucose) is
    broken down into CO2 and H2O, and energy is
    released.

9
Cellular Respiration
  • Most of this energy is stored as ATP and is used
    to supply energy to fuel the cells activities.
  • Most of the energy released is in the form of
    heat and helps maintain your body temperature.

10
Cellular Respiration
  • C6H12O6 6 O2 6 CO2 6 H2O energy (ATP)

Carbon Dioxide
Water
Oxygen
Glucose
11
Photosynthesis and Respiration Whats the
Connection?
Photosynthesis
6 CO2 6 H2O light energy C6H12O6 6 O2
Cellular Respiration
C6H12O6 6 O2 6 CO2 6 H2O energy (ATP)
12
Fermentation
  • Have you ever run so far or lifted weights so
    much that your muscles start to burn?
  • When your muscle cells cant get the oxygen they
    need to produce ATP by cellular respiration,
    fermentation happens.

13
Fermentation
  • Fermentation does not use oxygen and leads to the
    production of a small amount of ATP and products
    from the partial breakdown of glucose.
  • There are 2 types of fermentation
  • Occurs in muscle cells
  • Occurs in certain bacteria and yeast
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