4 mins
Respiration
Monday 24th April 2023
LO: To be able to describe the process of respiration
- Why do you think spiders not die when
you put them under a cup?
Key Words
Breathing
Respiration
Aerobic
Anaerobic
What would happen if you put a human under a
giant cup?
Breathing is the
mechanical
action of
getting air in and
out of the lungs.
Respiration is a chemical
reaction that produces
energy, so we can
function. It happens in
cells.
TASK – Write down the definitions in 10 words or less
P
R
E
P
A
R
E
Aerobic and Anaerobic Respiration
By the end of this lesson I will
be able to:
DevelopingDefine aerobic and anaerobic
SecureCreate the word and symbol equations
for both processes
ExtendingCompare and contrast the two forms of respiration
P
R
E
S
E
N
T
Aerobic and Anaerobic Respiration
Ever got a stitch?
What caused that? What were you doing?
P
R
E
S
E
N
T
Aerobic and Anaerobic Respiration
Demonstrating muscle fatigue: Arm clenching
1 Hold your arm up. Clench and unclench
your fist. Count how many times you can
do this before your arm feels tired and
begins to ache. Write down your results.
2 Put your arm down and rest it.
3 Now with your arm outstretched on the
bench, repeat the fist clenching exercise
and count how many times you can
clench your fist before your arm feels
tired and begins to ache. Write down
your results.
4 Share your results with those of the rest
of the class. Make a big table for all the data
collected. Who’s the henchest?
Gateacre School Science Department
P
R
E
S
E
N
T
Aerobic and Anaerobic Respiration
Aerobic means with oxygen.
Glucose + Oxygen
Energy)
Carbon dioxide + Water (+
Organisms do this normally
It’s the reason we need to breathe in oxygen
The other form is ANaerobic. What might that
mean?
6
P
R
E
S
E
N
T
Aerobic and Anaerobic Respiration
Anaerobic means without oxygen.
Word equation: Glucose
Lactic acid (+ Energy)
It releases around 5% of the energy released by aerobic respiration, per
molecule of Glucose (36ATP compared to 2 or 3)
If you’re exercising really hard, you body can’t create the amount of energy it
needs quick enough.
Instead of aerobic, it performs anaerobic. This skips a large chunk of the
reactions, and means you get the energy quicker
However it does cause a build up of lactic acid, which causes muscle pain and
stitches.
7
C
O
N
S
T
R
U
C
T
Aerobic and Anaerobic Respiration
Attempt to write the SYMBOL equations for both processes
Helpful hints – Glucose is C6H12O6
Lactic acid is HALF a glucose
Aerobic
Glucose + Oxygen
C6H12O6 + O2
→
→
Anaerobic
Glucose
C6H12O6
→
→
Carbon dioxide + Water (+ Energy)
CO2
+ H2O
Lactic acid (+ Energy)
C3H6O3
For the brave!
Remember the chemistry rule, you can’t
pull
Gateacre School Science Department
chemicals out of thin air or make them vanish.
Try and BALANCE these equations
C
O
N
S
T
R
U
C
T
Aerobic and Anaerobic Respiration
Attempt to write the SYMBOL equations for both processes
Helpful hints – Glucose is C6H12O6
Lactic acid is HALF a glucose
Aerobic
Glucose + Oxygen
C6H12O6 + O2
→
→
Anaerobic
Glucose
C6H12O6
→
→
Carbon dioxide + Water (+ Energy)
CO2
+ H2O
Lactic acid (+ Energy)
C3H6O3
For the brave!
Aerobic = C6H12O6 + 6O2 → 6CO2 + 6H2O
Anaerobic = C6H12O6
→ 2C3H6O3
Use the 3 words to write one sentence in the box below:
1.
Energy
Muscles
Move
2.
Food
Digest
Blood
3.
Breathe
Glucose
Heat
C
O
N
S
T
R
U
C
T
Aerobic and Anaerobic Respiration
Remember the chemistry rule, you can’t pull chemicals out of thin air or
make them vanish.
Try and BALANCE these equations, so there’s the same number on each
side
Aerobic
Glucose + Oxygen
C6H12O6 + O2
→
→
Anaerobic
Glucose
C6H12O6
→
→
Carbon dioxide + Water (+ Energy)
CO2
+ H2O
Lactic acid (+ Energy)
C3H6O3
C
O
N
S
T
R
U
C
T
Aerobic and Anaerobic Respiration
What do you actually need energy for?
Movement
Keeping Warm
Making larger molecules from smaller
C
O
N
S
T
R
U
C
T
Aerobic and Anaerobic Respiration
These are the fermenters in Brewdog
brewery in Aberdeen.
What links this with anaerobic
respiration?
C
O
N
S
T
R
U
C
T
Wednesday, 04 October 2023
Aerobic and Anaerobic Respiration
Yeast cells can also do anaerobic
respiration.
This is called fermentation, and is
how we make beers and wine as well
as bread
Glucose → Ethanol +Carbon Dixodie
C6H12O6 → 2C2H5OH + 2C02
A
P
P
L
Y
Wednesday, 04 October 2023
Aerobic and Anaerobic Respiration
(ii) Describe the process of respiration which takes place in human
beings when oxygen is not available and give an effect.
.........................................................................................................................
.
.........................................................................................................................
.
.........................................................................................................................
.
.........................................................................................................................
.
.........................................................................................................................
.
.........................................................................................................................
.
(3)
(Total 10 marks)
Undertake the exam questions
R
E
V
I
E
W
Respiration
M1.
(a)
Wednesday, 04 October 2023
to transfer / provide / give release energy
or production of ATP / adenosine triphosphate (molecules)
accept to give heat
1
(b)
(i)
C6H12O6 + 6O2 → 6CO2 + 6H2O
accept any other
n : 6n : 6n : 6n ratio
do not credit if any other changes have been made
1
(ii)
glucose
do not credit sugar / sucrose
1
(c)
(i)
any two from
large surface
thin (surface)
moist (surface)
(with a good) blood supply
R
E
V
I
E
W
Respiration
(ii)
Wednesday, 04 October 2023
carbon dioxide
accept water vapour
do not credit just water
(d)
(i)
anaerobic (respiration)
1
(ii)
any three from
in mitochondria
glucose decomposes / breaks down / reacts
or glucose → lactic acid for (2) marks
to give lactic acid
or breathing hard
or lactic acid → CO2 + water
causing pain
(leaving an) oxygen debt
(quick) source of energy
(but) less efficient than aerobic respiration
accept less efficient than with oxygen
R
E
V
I
E
W
Wednesday, 04 October 2023
Aerobic and Anaerobic Respiration
Releases energy.
Uses Glucose
Occurs in animals & plants
Does not use Oxygen.
Less Energy released.
Produces lactic acid in animals.
Produces alcohol in fermentation
Uses Oxygen.
More energy released
Does not produce lactic acid
Construct a Venn diagram
showing the similarities on
aerobic and anaerobic respiration
R
E
V
I
E
W
Wednesday, 04 October 2023
Respiration
Anaerobic
Aerobic
Uses Oxygen.
More Energy
Released
Does not produce
lactic acid.
Both
released
energy.
Does not use
Oxygen.
Less Energy released
Both use
Glucose
Occurs in
animals &
plants
Produces lactic acid
in animals.
Produces alcohol in
fermentation.