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Muscles and Muscle action


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cardiac, voluntary and involuntary
these are the three types of muscles
cardiac
these muscles are found in the walls of the heart and works automatically
voluntary
these muscles are also known as the skeletal muscles and are under conscious control and are attached to the skeleton
involuntary
these muscles are found in the walls of your vital organs and work automatically
antagonistic muscle pair
this is where two muscles work together in two different ways. One muscle contracts whilst the other relaxes
agonist
this is the muscle in the pair which contracts
antagonist
this is the muscle in the pair which relaxes
muscle contraction
the two types are isotonic and isometric
isometric
this is a type of contraction where your muscles are working but do not change length e.g. scrum in rugby
isotonic
this is a type of contraction where your working muscles change length e.g. running
immediate effects of exercise on the muscular effcts
these effects include: increased energy demand, build up of lactic acid and muscle ache and fatigue
long term effects on the muscular system
these effects include increased muscle strength and size (hypertrophy)
rest
allows muscles to rapir damage ready for next session
protein
this helps muscle growth and repair
anabolic steroids
these increase size/strength of muscles and speed up recovery rate after training