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Muscle review

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Review of key concepts about the muscles
For Preliminary PDHPE

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Muscle review

  1. 1. CONTRACT VS RELAX • Muscles work by contraction (or shortening). • When they do they pull on the bone, causing movement. The muscle that is responsible for the movement is called the agonist. • When a muscle contracts, it has an opposing muscle that relaxes (or lengthens) at the same time. This is called the antagonist. • Muscles can be agonists or antagonists, depending on the direction of the movement. • Muscles can also be stabilisers. This means the muscles act at a joint to hold it still or stable. This provides a fixed strong base for muscle movement.
  2. 2. The main muscles involved in movement • Upper body deltoid, pectorals, biceps, triceps, latissimus dorsi, trapezius, rectus abdominis, external obliques, erector spinae • Lower body quadriceps, hamstrings, gluteus maximus, gastrocnemius, soleus, tibialis anterior
  3. 3. WHERE YOU AT? • Skeletal muscles attach to bones. They span across a joint (ie are attached to at least 2 different bones) • They can attach directly to a bone or attach by a tendon. • The point of attachment that to the more stationary bone is the origin of the muscle. It is usually closer to the trunk. • The point of attachment to the movable end is the insertion. It is usually further from the centre of the body.