The Muscular System
Muscles are the driving force behind movement. There are 11 main muscles that we know as voluntary muscles, these are:
- Latissimus Dorsi
Voluntary muscles bring about movement. They can be consciously controlled and trained to be stronger and work for longer periods. They are called voluntary muscles because we can control them.
Involuntary muscles contract and lengthen by themselves as happens in internal organs. For example those in the gut are involved in processes we cannot contain such as digestion.
- Abducts the upper arm from the body.
- Serve in Tennis
- Rotates the shoulder blade backwards
- Rotates the upper arm at the shoulders.
- Swimming (Butterfly stroke).
- Adduction of Arm
- Swimming (Front crawl).
- Flexion and rotation of trunk.
- Flexion of arm at the elbow
- Bending the arm to throw a cricket ball.
- Extention of the arm at the elbow.
- Straightening the elbow to throw a cricket ball.
- Extention of the upper leg.
- Running and maintaining a good posture.
- Extention of the leg at the knee.
- Kicking a football.
- Flexion of the leg at the knee.
- Sprinting; When a leg bends.
- Plantar flexion of the foot.
- Running; pushes onto the toes.
Muscles working in pairs. One will contract as the other pulls to allow the joint to work. Biceps are triceps are arranged this way.
Isometric Contractions occur when the muscle contracts but stays in a fixed position. These are not used in sport as much as Isotonic contractions. E.G. Plank Position.
This is where a muscle contracts that results in a limb movement.
This is the scientific term for an increase in the size of muscle.
The loss of muscle, mass and strength.