Transcript Molecules of Life

Respiration
Part 1
Learning Objectives
• Learn about why animals and plants need
energy.
• Understand what respiration is.
• Understand what respiratory quotients (RQs)
are.
Success Criteria
• I can state the word and symbol equation for
respiration.
• I can list what energy released from respiration
is used for.
• I can explain what the role of ATP is.
Starter
• Watch your teacher demonstrate the ‘screaming jelly baby’.
• This demo shows how much energy is stored in a single sweet!
• In what process is the energy released in your body?
Energy & Respiration
• Plants and animals need energy to carry out life processes such as
movement.
These people are able to
run because energy is
being released from their
food.
This happens in their cells
(inside mitochondria).
• To release energy, animals and plants need glucose and oxygen.
• Releasing energy in cells is called RESPIRATION.
Aerobic Respiration
• Aerobic respiration uses oxygen to release energy.
• The word equation for aerobic respiration is:
glucose + oxygen  carbon dioxide + water
• The symbol equation for aerobic respiration is:
C6H12O6 + 6O2  6CO2 + 6H2O
Aerobic
respiration is
the way we
release energy
when we are
sleeping or are
at rest
Task
1. Which gas is used in aerobic respiration?
2. Which gas is produced during aerobic respiration?
3. Write down one life process that needs energy.
4. The reactions involved in respiration require
biological catalysts known as __________.
Energy for what?
• Create a mind map on what energy from respiration is used for.
Energy
released by
Respiration
Rate of Respiration
• The rate of respiration in an organism can be measured using a
respirometer.
Putting a mouse in a
respirometer allows us
to measure rate of
respiration.
If the mouse moves
around, it needs more
oxygen for respiration
and breathes faster.
This causes the
coloured water to
move more.
Rate of Respiration
• Another way of describing rate of respiration is the respiratory
quotient (RQ).
• It can be calculated with the formula:
RQ = carbon dioxide produced
oxygen used
Have a go:
A mouse takes in 2.0 cm3 of oxygen. It releases 1.4 cm3
of carbon dioxide. Calculate the RQ value.
1.4/2.0 = 0.7
Respiratory Quotient = 0.7
HIGHER
ATP
• The energy released by respiration is stored in a molecule known
as:
ATP (Adenosine Triphosphate)
• ATP molecules can be used as an energy source for many
processes inside cells.
Metabolic Rate
• Your metabolic rate is the amount of energy you body needs.
• It can be estimated simply by measuring how much oxygen has
been breathed in.
Task
• Answer questions 6-8 on page 19 of the new student textbook.
ANSWERS:
6. Stored and then used as an energy source for processes in cells.
7. Aerobic respiration releases energy by using oxygen. This means
oxygen uptake can be used as a measure.
8. Respiration requires enzymes. Enzymes have an optimum
temperature. Snakes warm up their bodies to provide enzymes
inside cells with the optimum temperature.
PLENARY
Using pages 18-19, create a quick-quiz of around 5
questions for the person sitting next to you.
Give them your book to answer the questions, and
then take their book to do the same yourself.
Hand the book back to get the answers marked.
Learning Objectives
• Learn about why animals and plants need
energy.
• Understand what respiration is.
• Understand what respiratory quotients (RQs)
are.
Success Criteria
• I can state the word and symbol equation for
respiration.
• I can list what energy released from respiration
is used for.
• I can explain what the role of ATP is.