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Human Systems:

Muscular System. Human Systems:. Muscle cells have contractile proteins Contract and relax Help in movement Heart muscles Blood vessels Stomach. Muscle. 3 types of muscles Smooth muscles (digestive tract, blood vessels) Cardiac muscle ( heart) Skeletal muscle (attached to bones)

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Human Systems:

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  1. Muscular System Human Systems:

  2. Muscle cells have contractile proteins Contract and relax Help in movement Heart muscles Blood vessels Stomach Muscle

  3. 3 types of muscles • Smooth muscles (digestive tract, blood vessels) • Cardiac muscle ( heart) • Skeletal muscle (attached to bones) • Muscle action could be voluntary or involuntary • Smooth and cardiac muscles are involuntary • Skeletal muscles could be voluntary or involuntary (e.g. blinking of eyes) Types of muscles

  4. Types of muscles

  5. Muscles are attached to bones through tendons When muscle shortens (contracts), the bones are pulled closer When muscle relaxes, bones move away Musculoskeletal system - movement Movement

  6. Muscles work in pairs Flexor (Biceps) - bends a part of the body Extensor (Triceps) – straightens a part of the body Movement Bicep is flexor Tricep is extensor

  7. Lever Levers increase the amount of work done by a force (mechanical advantage) Three types of levers Levers in human body

  8. Levers in human body

  9. Resistance exercise (increases muscle strength) Aerobic exercise (strengthens heart) Muscle and exercise

  10. Strain – muscle or tendon over stretched or torn Tendinitis – inflammation of tendons Anabolic steroids – can be helpful in increasing muscle strength but may be associated with causing other problems Muscle fatigue and lactic acid Muscle injury and problems

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