Aerobic Respiration

1. Aerobic Respiration
LOWER SECONDARY SCIENCE GRADE 7
MR. CHRISTOPHER FERNANDEZ OBRA

2. Lesson Objectives:
◼ Describe the process and write
an equation for cellular
respiration.
◼ Explain how changing energy
needs affect respiration.

3. What is “Aerobic Respiration”?
A chemical process in which oxygen is used to make energy
from carbohydrates (sugars).
Also called:
- aerobic metabolism,
- cell respiration,
- oxidative metabolism.

4. What is “Aerobic Respiration”?
It is one of the main ways in which cells gain energy to fuel their
cellular activity.
◼ C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

5. Energy in our bodies is stored as ATP.
◼ The energy is stored in a
molecule called ATP (adenosine
triphosphate), which can then be
used to provide energy to other
parts of the cell.

6. Aerobic Respiration
◼ This process produces carbon
dioxide, a waste product, which must
be expelled.
◼ Where does carbon dioxide come
from our body?

7. Why exactly do our cells need energy?
◼ Our cells need energy to do work.
◼ Therefore, oxygen is essential so that our cells that make up our tissues,
organs, organ systems and bodies can do their jobs!

8. Quick Check! Notebook
◼ State the reason why cells need oxygen.
◼ Recall where the carbon dioxide that we exhale comes from.
◼ State the name of the molecule that is used to store energy in the body.
◼ Write down the word equation for cellular respiration.

9. Quick Check! Notebook

10. Breathing and energy.
If the amount of energy we
use changes, our respiratory
system must adjust so that our
cells can continue to produce
enough energy.

11. How will it compensate our bodies the need of energy?
◼ Our respiratory system adjusts
to changing energy
requirements by adjusting
our breathing rate.
◼ For example, during exercise,
where our cells require a lot of
energy, our breathing rate
increases, so that each cell gets
more oxygen and can make more
energy.

12. Changing energy needs will affect respiration.
In contrast, if our energy requirements
decrease, such as when we are
sleeping, our breathing rate
decreases, so that each cell gets just
enough oxygen to make the energy
required and no more.

13. Quick Check!
1. State what happens to our breathing rate if our energy
requirements increase.
2. Baby Rosa has just fallen asleep, Identify what has happened to
the energy requirements of his cells.
3. Tev and Mishi have started doing some exercise., Identify what has
happened to the energy requirements of their cells.

14. Complete the statement

15. Long Answer
Explain why our cells need oxygen.
In your answer, also include the name of the cellular
process that uses oxygen and state what is produced as a
result of this process.

16. Summary
◼ When our energy needs change, the amount of oxygen needed for
our cells to carry out respiration change.
◼ To supply this different amount, our breathing rate adjusts.
◼ For example, during exercise, our breathing rate increases, so that
each cell gets more oxygen and can make more energy. In contrast, if
our energy requirements decrease, such as when we are sleeping,
our breathing rate decreases.