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Contents
Respiration
An energy-making process
Waste products
What is respiration?
Aerobic respiration
Anaerobic respiration
Summary quiz
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An energy-making process
We know that we breathe constantly throughout life.
Also, we know that if we stopped breathing we would
eventually die.
So, breathing in oxygen (O2) must be linked to something that
we need constantly and without it our bodies would die.
The answer is ENERGY making.
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Ingredients to make energy
The energy-making process depends on the breathing
system and the digestive system.
Imagine a fire...
This will produce energy in the form of heat but only if
it is supplied with 2 main ingredients.
FUEL OXYGEN
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Our fuel
The bodies energy-making reaction needs similar
things to the energy-making process of fire.
Like the fire, the body needs oxygen and a fuel.
the oxygen is and the fuel (in the form of
supplied by the
breathing
system
+ digested food) comes courtesy
of the digestive system.
2
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Our pipelines to the cells
If we now think back over the journey of oxygen and
digested food through the human body, we will
realise that they both end up in the same place.
food oxygen
breathing
system
digestive
these substances system
eventually arrive
BLOOD
at the body cells
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