B4-10 Aerobic respiration

1. IB4.10.2H Images
On a whiteboards, in
pairs;
List as many things that
you do which require
energy!!!
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2. IB4.10.2H Images
Aerobic respiration
Give examples of how cells use energy
released in respiration, including the
synthesis of polymers
Describe the role of aerobic respiration in
providing energy
Describe cell structures and how they are
involved in respiration
Keywords- aerobic respiration, mitochondria,
polymers,
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3. IB4.10.2H Images
Life processes Human activities
movement, cooking,
generating body heat, driving,
producing proteins electric lights
Active transport
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4. IB4.10.2H Images
Where does the energy for
different processes come from?
Energy for life processes comes ultimately
from sunlight, through food chains. This food
needs to be broken down to release the
energy in a form that the cells can use. The
stage which allows the release of energy for
the cells is the process of respiration.
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5. IB4.10.2H Images
investigate the energy in foods by
completing Activity AB4.10.1
Releasing the energy in food.
Consider the importance of correctly
collecting data.
how we can’t be sure that the temperature change
measurements give us a true indication of the
nutritional energy value of the foods?
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6. IB4.10.2H Images
Calculation formula
energy (Joules) = mass of water (g) × change in temperature (°C) × 4.2
Note that:
1 cm3 of water has a mass of 1 g
It takes 4.2 Joules of energy to increase the temperature of 1
g of water by 1 °C.
4.2 is the specific heat capacity of water.
Units are generally kJ/kg/°C but in this instance it has been factored down
to J/g/°C.
* You should be able to calculate the energy in an example using this
equation, and use the correct units
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7. IB4.10.2H Images
the typical features of plant and animal
cells; where does respiration takes place?
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8. IB4.10.2H Images
Some of the
reactions for
respiration take
place in the cell
cytoplasm, and
many happen inside
mitochondria. This
electron micrograph
shows a single
mitochondrion.
(Magnification X
64000.).
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9. IB4.10.2H Images
Structures used in respiration in plant and animal cell,
draw the cells in your book and label the structures.
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10. IB4.10.2H Images
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11. IB4.10.2H Images
The energy from respiration is used in reactions that
make many different molecules. These include polymers
of glucose (starch and cellulose) and proteins, fats, and
oils.
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12. IB4.10.2H Images
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13. IB4.10.2H Images
This girl is using energy for many
different actions – such as
processing information in her
brain, moving, maintaining a
constant internal environment, and
growing and repairing her tissues.
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14. IB4.10.2H Images
Three flasks are set up:
peas previously boiled for 5 minutes and then
cooled to room temperature
peas frozen and left to warm to room temperature
peas just have been soaked to start germination.
How will temperature show what is
happening to the peas?
Think about living processes- whiteboards
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15. IB4.10.2H Images
The germinating peas should show an increase in
temperature within the flask as respiration gives off waste
heat energy.
This should also occur in the flask with the frozen peas as
low temperatures do not destroy enzymes.
The peas which have been previously boiled should show
no such rise in temperature, since the enzymes needed
for respiration have been destroyed. Note that if there has
been some contamination with the dead peas, then a
temperature increase may be seen as decomposition
takes place. Boiling should be sufficient to prevent this,
but washing the peas with antiseptic is also an option.
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16. IB4.10.2H Images
You need to be able to explain:
the process of aerobic respiration is one which
releases energy in foods for cell processes.
Identify where it happens in cells
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17. IB4.10.2H Images
Homework
Write out the investigation
Start with a question
Think about reliability
Come to a conclusion
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