Short term changes to the body When you exercise changes happen
to the body to help it cope with the extra demands put upon it.
What happens to the following body systems as you exercise? 1.
Muscular 2. Respiratory 3. Circulatory
Slide 3
Short term changes to the body Muscular System The muscles work
harder. Respiration increases in the muscle fibres to prepare extra
energy. The muscles that contract squeeze the veins, which push
blood back to the heart faster.
Slide 4
Short term changes to the body Respiratory System The lungs
begin to breathe faster and deeper. They get rid of carbon dioxide
and take in oxygen at a faster rate. Because the lungs work harder
more oxygen reaches the muscles each minute and more carbon dioxide
is removed.
Slide 5
Short term changes to the body Circulatory System The heart
begins to beat faster to pump blood around the body faster. The
arteries expand so that blood pressure does not get too high. Blood
is moved from where there is less need for it to the areas that are
working e.g. from the stomach to the legs. The increase in
respiration produces heat so that blood is heated up. Therefore it
is moved closer to the skin to cool it which causes reddening.
Slide 6
Long Term Changes To The Body If you exercise on a regular
basis further changes will happen to your body systems. What
happens to the following body systems if you exercise regularly? 1.
Muscular 2. Respiratory 3. Circulatory 4. Skeletal
Slide 7
Long Term Changes To The Body Muscular System Muscles become
stronger. Muscles become bigger. Muscles are able to work for
longer without tiring. Tendons become stronger. Respiratory system
Gaseous exchange becomes more efficient. Tidal volume (how much we
are able to breathe in and out on each breath) increases. Lung
capacity increases.
Slide 8
Long Term Changes To The Body Circulatory system The heart
becomes bigger The heart becomes stronger. The heart is able to
pump more blood with each beat. As a result heart rate at rest
decreases. There is increased capilliarisation at muscle and at
alveoli. Skeletal system Bones become stronger. Joints become more
mobile. Ligaments become stronger.