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Muscles and Exercise
Muscles are involved in
movement and support of the
body. When they work, they
use a lot of energy. Muscle is
composed mainly of protein
fibres which must contract in
order to do some work. The
muscle tissue contains many
mitochondria to supply the
energy required for aerobic
respiration…read more

Slide 3

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Cellular respiration gains its fuel from glucose
which can be converted rapidly from
glycogen which has acted as a store of
carbohydrate.
· Respiration is much more efficient when it
has a supply of oxygen but as muscles work
harder, the supply of this gas decreases and
more carbon dioxide has to be removed. A
further biproduct of respiration is water…read more

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During exercise, the muscles require an
increased supply of blood. For this to happen,
the arteries dilate and the heart rate must
increase. We will also breathe faster and more
deeply.…read more

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Exercise is beneficial for many reasons. The
heart and lungs both become larger and the
blood supply to them improves as well. As a
person becomes fitter the resting heart rate
will decrease as should their breathing rate…read more

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The heart rate is normally measured in beats per
minute and is easily found by taking a person's
pulse. An easy place to take this is either in the
neck or the wrist. An idea of a person's fitness
can be gained by seeing how fast the heart rate
returns to normal after a period of exercise.…read more

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