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Neuromuscular control

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Neuromuscular control involves understanding how muscle structures create movement through coordination. Messages from the brain initiate muscle contractions by motor neurons stimulating muscle fibers in motor units. The number and size of motor units varies depending on a muscle's function, with large muscles for gross movements having more motor units than smaller muscles. Muscles contract according to the all-or-nothing principle, where motor units either contract fully or not at all depending on whether nerve impulses reach the threshold level.

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+ Neuromuscular Control
+ Key Concepts It is important to understand the microscopic structure of skeletal muscle and how these structures assist with creating movement. Muscles create movement by pulling on the bone to which they attach. In order to do this, messages are sent from the brain to the muscles to initiate movement. Muscles coordinate in pairs to produce coordinated movement
+ Nervous Control of muscles
+ A motor unit A motor unit consists of one motor neuron and the muscle fibre it stimulates (Each neuron may stimulate a number of muscle fibres) Depending on the size and function of a muscle will depend on the number of motor units it has Example: The quadriceps is responsible for gross movement such as kicking and jumping. It has a very large number of motor units The muscles that control movements like writing and typing have only a small number of motor units.
Neuromuscular control
+ The all or nothing principle The nerve impulse will not stimulate the muscle fibres until it reaches a certain threshold level. Once the nerve impulse reaches this threshold, all fibres of the motor unit will contract at the same time and maximally. If the impulse is too weak, no fibres will contract. Therefore depending on the force required for a movement will impact the number and speed of nerve impulses sent.

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Neuromuscular control

  • 2. + Key Concepts It is important to understand the microscopic structure of skeletal muscle and how these structures assist with creating movement. Muscles create movement by pulling on the bone to which they attach. In order to do this, messages are sent from the brain to the muscles to initiate movement. Muscles coordinate in pairs to produce coordinated movement
  • 4. + A motor unit A motor unit consists of one motor neuron and the muscle fibre it stimulates (Each neuron may stimulate a number of muscle fibres) Depending on the size and function of a muscle will depend on the number of motor units it has Example: The quadriceps is responsible for gross movement such as kicking and jumping. It has a very large number of motor units The muscles that control movements like writing and typing have only a small number of motor units.
  • 6. + The all or nothing principle The nerve impulse will not stimulate the muscle fibres until it reaches a certain threshold level. Once the nerve impulse reaches this threshold, all fibres of the motor unit will contract at the same time and maximally. If the impulse is too weak, no fibres will contract. Therefore depending on the force required for a movement will impact the number and speed of nerve impulses sent.