Cell Energy:

Here Comes the Sun!
Cell Energy
 Why do you
get hungry?
 Feeling
hungry is
your body’s
way of
telling you
that your
cells need
energy!
From Sun to Cell
 Plants capture energy
from the sun and
change it into food
through a process
called

PHOTOSYNTHESI
S
 Food that plants
make supplies
them with
energy.
 This food also
becomes a
source of energy
for organisms that
eat plan...
Photosynthesis:
 Photosynthesis: process by which plants,
algae, and some bacteria use

Sunlight
carbon dioxide
and water...
 Chlorophyll is the
main pigment
used in
photosynthesis
 It gives plants
their green color
 Chlorophyll is
found in
chl...
 Plants use the energy captured
by chlorophyll to change
CARBON DIOXIDE and WATER
Into FOOD

CO2 +

=
 The food is in the form of the simple
sugar GLUCOSE, which is a
carbohydrate
 The energy in glucose is used by the
plan...
Getting Energy from Food
 Animal cells have different ways of getting
energy from food such as:
*Cellular respiration: us...
Cellular Respiration
 Respiration means
“breathing”
 Most complex
organisms, from
cows to humans,
obtains energy
through...
 During cellular respiration, food (such
as glucose) is broken down into carbon
dioxide and water, and energy is
released...
 Some of the energy is used to form
ATP (which supplies energy that fuels
cell activities)
 Most of the process of cellu...
 In the cells of eukaryotes, cellular
respiration takes place in the
mitochondria
 The equation for cellular respiration...
Connection Between Photosynthesis
and Respiration
 Photosynthesis transforms energy from the
sun into glucose, cells use ...
Fermentation
 Have you ever
felt that
burning
sensation in
your leg
muscles when
you run?
 When muscle
cells just can’t
get enough
oxygen for
cellular
respiration, they
use the process
of fermentation
to get ene...
 One kind of
fermentation
happens in your
muscles and
produces lactic
acid (this is why
you get muscle
cramps—a buildup
o...
 Another type of
fermentation
occurs in some
types of bacteria
and in yeast
 In a general sense, fermentation is the
conversion of a carbohydrate such as sugar
into an acid or an alcohol. More spec...
 Fermentation is a way that
cells get energy from their
food without using oxygen
 Yeast forms carbon
dioxide during
fer...
Cell energy
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Cell energy

  1. 1. Cell Energy: Here Comes the Sun!
  2. 2. Cell Energy  Why do you get hungry?  Feeling hungry is your body’s way of telling you that your cells need energy!
  3. 3. From Sun to Cell  Plants capture energy from the sun and change it into food through a process called PHOTOSYNTHESI S
  4. 4.  Food that plants make supplies them with energy.  This food also becomes a source of energy for organisms that eat plants.
  5. 5. Photosynthesis:  Photosynthesis: process by which plants, algae, and some bacteria use Sunlight carbon dioxide and water to make food
  6. 6.  Chlorophyll is the main pigment used in photosynthesis  It gives plants their green color  Chlorophyll is found in chloroplasts.
  7. 7.  Plants use the energy captured by chlorophyll to change CARBON DIOXIDE and WATER Into FOOD CO2 + =
  8. 8.  The food is in the form of the simple sugar GLUCOSE, which is a carbohydrate  The energy in glucose is used by the plant’s cells 6CO2 + 6 H20 + light energy = C6H12O6 + 6O2
  9. 9. Getting Energy from Food  Animal cells have different ways of getting energy from food such as: *Cellular respiration: uses oxygen to break down food *Fermentation: the breakdown of food without the use of oxygen
  10. 10. Cellular Respiration  Respiration means “breathing”  Most complex organisms, from cows to humans, obtains energy through respiration
  11. 11.  During cellular respiration, food (such as glucose) is broken down into carbon dioxide and water, and energy is released  Most of the energy released maintains body temperature
  12. 12.  Some of the energy is used to form ATP (which supplies energy that fuels cell activities)  Most of the process of cellular respiration takes place in the cell membrane of prokaryotic cells
  13. 13.  In the cells of eukaryotes, cellular respiration takes place in the mitochondria  The equation for cellular respiration is almost a complete opposite of photosynthesis! C6H1206 + 602 -> 6CO2 + 6H20 + ENERGY (ATP)
  14. 14. Connection Between Photosynthesis and Respiration  Photosynthesis transforms energy from the sun into glucose, cells use carbon dioxide to make glucose, and the cells release oxygen  During cellular respiration, cells use oxygen to break down glucose and release energy and carbon dioxide  Each process makes the materials that are needed for the other process to occur elsewhere
  15. 15. Fermentation  Have you ever felt that burning sensation in your leg muscles when you run?
  16. 16.  When muscle cells just can’t get enough oxygen for cellular respiration, they use the process of fermentation to get energy
  17. 17.  One kind of fermentation happens in your muscles and produces lactic acid (this is why you get muscle cramps—a buildup of acid!)
  18. 18.  Another type of fermentation occurs in some types of bacteria and in yeast
  19. 19.  In a general sense, fermentation is the conversion of a carbohydrate such as sugar into an acid or an alcohol. More specifically, fermentation can refer to the use of yeast to change sugar into alcohol or the use of bacteria to create lactic acid in certain foods. Fermentation occurs naturally in many different foods given the right conditions, and humans have intentionally made use of it for many thousands of years.  earliest uses of fermentation were most likely to create alcoholic beverages such as mead, wine, and beer.
  20. 20.  Fermentation is a way that cells get energy from their food without using oxygen  Yeast forms carbon dioxide during fermentation. The bubbles of carbon dioxide gas cause the dough to rise and leave small holes in the bread after it’s baked.
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