The Muscular system. What is a muscle? There are 2 main kinds of muscle: Skeletal – muscle found surrounding our skeleton. We can consciously control skeletal muscle, which allows us to move.
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There are 2 main kinds of muscle:
In P.E. we look mainly at Skeletal Muscle
The Bicepbends the arm at the elbow, bending is called Flexion and the Tricepdoes the opposite, itstraightens the elbow, straightening is called Extension.
Important: Skeletal Muscle groups, work in pairs! One muscle group moves a joint in one direction & the other will move the joint in the opposite direction.
The bicep and tricep muscle groups are the pair that move the elbow joint.
When the prime mover of the elbow joint is biceps the elbow bends or flexes.
The prime mover of any joint is called the Agonist. In this example biceps is the agonist.
For this to happen triceps must relax & stretch to allow the bicep to work & the elbow to bend. The relaxing muscle is called the Antagonist. Triceps in this case is the antagonist.
If we change the movement, what happens?
If the prime mover of the elbow joint is now triceps the elbow will straighten or extend.
Remember, the prime mover of any joint is called the Agonist. This time the agonist is triceps.
For this to happen biceps must relax & stretch to allow the triceps to work. This time the relaxing muscle orAntagonist is biceps.
The dominating muscle of the shoulder is the Deltoid.
The Deltoid has 3 different parts.
1. Anterior aspect
2. Medial aspect
3. Posterior aspect
The deltoid muscle allows lots of different movements at the shoulder joint. Flexion, extension, Circumduction, rotation, etc etc.
There are a few groups that make up the abdominal family. The 2 we can see are Rectus Abdominus(the 6 pack ) & theExternal Obliques. The Abs flex & rotate our trunk.
The Pectoralisare the chest ‘Gorilla’ muscles of the human body. The Pecs push our arms forward at the shoulder.
Many of the muscles in the legs have individual names but we will refer to them by their group names
(hip extension) hidden behind the hip flexors see next slide.
Tibialis Anterior is the muscle you use to lift your toes
Soleusis underneath Gastrocnemius. They are our calf muscles.Both muscles are used when you tap your toes. They work in a pair with tibialis anterior
The Glutealsare the muscles that form your bum.
They are used to straighten the leg at the hip (hip extension), when you stand up from sitting.