4.2 Respiration
7.1.d Students know that mitochondria
liberate energy for the work that cells do
and that chloroplasts capture sunlight
energy for photosynthesis.
What is Respiration?
Respiration-
the process but which cells obtain
energy from glucose
Key Concept: “During respiration, cells break
down simple food molecules such as sugar and
release the energy they contain.
Cells of all living things carry out respiration
because they need energy
Cells store energy like we store money in a bankcapture energy from sun and save during
photosynthesis- when need energy the break
down carbohydrates in respiration
Two Stages of Respiration
During
respiration, cells break down
simple food molecules such as sugar and
release the energy they contain.
What is Respiration?
2
meanings for respiration- cellular respiration
and breathing
Products of respiration-carbon dioxide and water
We breathe out carbon dioxide
Plants undergo Photosynthesis and make its own
food (sugar)
Animal cells (and some others) get their glucose
from eating plants or animals that ate plants
Respiration and Photosynthesis keep levels of
oxygen constant on Earth
Respiration video
What is Respiration?
Respiration
Sugar
equation:
Oxygen
Yields
Raw
Carbon
Dioxide
Materials
Video on Cellular respiration
Water
Products
Photosynthesis and Respiration
You can think of photosynthesis and respiration
as opposite processes.
The 2 Equations
+ energy
Fermentation
Fermentation-
energy
releasing process does
not need oxygen
Key concept:
“Fermentation provides
energy for the cell
without using oxygen.”
Amount of energy
released is less than
during respiration
Mitochondria
Fermentation- Alcoholic
Type
of fermentation when
yeast and some other single
celled organisms break down
sugars
Called alcoholic because one
of its products is alcohol
Other products are carbon
dioxide and energy
Important to bakers- raises
dough and creates bubbles in
alcohol drinks
Fermentation- Lactic Acid
Takes
place at times in your
body
When running muscle cells use
oxygen faster than it can
replace it
Cells lack energy and
fermentation occurs
Product is lactic acid
When the lactic acid builds
up you feel pain (and
weakness) in your muscles
Section 2: Respiration
What events occur
during respiration?
What is fermentation?
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