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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.