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Skeletal muscle.
· There are nearly 650 skeletal muscles in the human body!
· Skeletal muscles are attached to the skeleton
· They work in pairs: one muscle moves the bone in one direction and the
other moves it back again
· Skeletal muscles are voluntary muscles - in other words we think about
what movements we want to make (at least, usually!) and send messages
via our nervous system to tell the appropriate muscle(s) to contract.
· Muscle contractions can be short, single contractions or longer ones.…read more

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Smooth muscle.
· Smooth muscle is found in our internal organs: in our
digestive system, our blood vessels, our bladder, our
respiratory organs and, in a female, the uterus.
· Smooth muscle can stretch and maintain tension over
extended periods
· Smooth muscles are involuntary muscles - in other words we
do not have to think about contracting them because they are
controlled automatically by the nervous system. It would be
pretty inconvenient if we had to think about digesting our
food, for example!…read more

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Cardiac muscle.
· As the name should tell you, cardiac muscle is found only in the heart.
· It can stretch, just like smooth muscle, and contract like skeletal muscle.
· It is a twitch muscle - it only does short single contractions
· Like smooth muscle, cardiac muscle is involuntary. It'd be rather
dangerous if it were voluntary - we could stop our heart beating any time
we wanted!…read more

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Diagram of muscular system.…read more

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Long term effects of exercise.
· Increased numbers of mitochondria (the cells powerhouse) means an
increase in the rate of energy production.
· The muscles, bones and ligaments become stronger to cope with the
additional stresses and impact put through them.
· The amount of myoglobin within skeletal muscle increases, which allows
more Oxygen to be stored within the muscle, and transported to the
· Muscles are capable of storing a larger amount of glycogen for energy.
· Enzymes involved in energy production become more concentrated and
efficient to aid the speed of metabolism.…read more

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