Nervous system Flashcards
1
Q
What is the role of the nervous system
A
It is the main control and communication centre of the body
2
Q
Name the main structures of the central nervous system
A
Brain and spinal cord
3
Q
Name the main structures of the peripheral nervous system
A
All nerves that lie outside the spinal cord
4
Q
What is the main difference between a sensory and a motor neuron
A
A sensory neuron carries information to the CNS from sensory organs
A motor neurone carries information from CNS to sensory organ
5
Q
What is a motor unit
A
A motor unit consists of a single motor neurone and all the muscle fibres it innervates (5-1000)
6
Q
Describe the all or none law
A
When an impulse is sent to a motor neurone either all or none of the muscle fibres in the motor unit are innervated
