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Your heart is a blood ­ filled bag of muscle, which acts like a
When your heart contracts, your heart squeezes out blood
When you heart relaxes, your heart fills up again with blood
This non ­ stop action circulates blood around your body
Your heart works all your life without rest
Blood vessels that carry blood away from the heart, are
called arteries
Blood vessels that carry blood to your heart, are called veins
Blood carries essential nutrients and oxygen to all the…read more

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Child 80 ­ 100 60
Teenager 90 ­ 110 60
Adult 110 ­ 125 60 ­ 70
Middle - aged 130 ­ 150 80 ­ 90
High 160 105
Low 90 40
Blood pressure is affected by weight, stress, diet, age, smoking
and intake of alcohol
Blood pressure problems
If blood pressure is too high ( hypertension ), this can result
in burst blood vessels, damage to the brain, strokes or
kidney damage
If blood pressure is too low, this can result in dizziness,
fainting…read more

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Aerobic respiration
In aerobic respiration cells get enough oxygen
Glucose + Oxygen Carbon Dioxide + Water ( + Energy )
C H O + 6O 6CO + 6H 0 ( + Energy )
During hard exercise the oxygen supply is insufficient to
meet energy demands so anaerobic respiration takes place in
addition to aerobic respiration…read more

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Anaerobic respiration
In anaerobic respiration cells are not getting enough oxygen
Glucose Lactic Acid ( + Energy )
Anaerobic respiration releases much less energy than aerobic
After hard exercise lactic acid builds up in muscles
This can cause pain in muscles ( cramp ) and a sensation of
fatigue in the muscles
During anaerobic respiration an oxygen debt builds up
After exercise heavy breathing ( panting ) for a few minutes
replaces the oxygen
The heart continues to build up faster than normal exercise…read more

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Anaerobic respiration releases much less energy than aerobic
Fitness can be measured as strength, stamina, flexibility,
agility, speed and cardiovascular efficiently ( how well your
heart and lungs work )
Health and fitness are not the same thing…read more


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