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B2 Topic 1 Respiration
Topic 2 Photosynthesis

Science B3 Topic 3 Fieldwork



The process by which cells release energy from glucose

Where does respiration take place?

What happens during respiration?

When does respiration happen?

Why do living things need respiration?


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Why do living things need respiration?

Uses of energy:
· temperature control
· muscle movement
· sending nerve impulses
· transport around the body
· growth and repair
· absorbing food

Why is intensive farming a cheaper alternative to
free range farming?


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When does respiration happen?

· Occurs all the time
· Some cells respire more than others e.g. muscle cells,
brain cells
· Rate increases when doing physical exercise

What happens during respiration?
Aerobic In the presence of oxygen

glucose + oxygen carbon + water + energy

Anaerobic Respiration The…

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Unit of

Where does respiration take place?


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Gas Exchange

We need to get oxygen from the air into the blood, and we
need to remove waste carbon dioxide from the blood into
the air. Moving gases like this is called gas exchange. The
alveoli are adapted to make gas exchange in lungs happen
easily and efficiently.


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The gases move by diffusion from where they have a high concentration
to where they have a low concentration:

Oxygen diffuses from the air in the alveoli into the blood.

Carbon dioxide diffuses from the blood into the air in the alveoli.

Complete the diagram to show gas exchange in…

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Investigating Gas Exchange

The purpose of this experiment is to measure the relative
amounts of carbon dioxide in the air we exhale while at rest
and after exercise.

How do you think the amounts of carbon dioxide will compare
between at rest and after exercising?

1. Sit…

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1. What does the number of drops of ammonia tell us about the
amount of carbon dioxide exhaled?

The greater number of drops of ammonia, the greater amount of
carbon dioxide exhaled.

2. What have you discovered about the effect of exercise on the
amount of carbon dioxide…

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Cardiac Output
The amount of blood circulated by the heart. Depends upon heart
rate and stroke volume. - number of
Heart Rate
times the heart beats per
Cardiac Heart minute
= x Stroke Volume - Volume of
Output Rate Volume
blood pumped out of the
heart on each beat…

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The more active a cell the more energy it needs so respiration
must happen at an increased rate.

Plot the results for Kelly and Rutvi to show how their
breathing and heart rates change during and after exercise

Which person has the fastest recovery time?
Explain your answer

Explain the…




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