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Title: The Nervous System
Description: Great, clear, easy to understand notes on the workings of the Nervous system
Description: Great, clear, easy to understand notes on the workings of the Nervous system
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The nervous system:
The brain and the spinal cord form the CNS, which is responsible for
coordinating, processing and storing information
...
Figure 1 – Structure of a neuron
Figure 2 – Cross section of a vertabra
- Neurons have fibres along which nerve
impulses travel
...
- Peripheral nerves are enclosed in a
sheath of white fat called myelin
...
The myelin
sheath assists in the transmission of
electrical impulses along the neuron
...
- Mechanoreceptors detect pressure, touch,
tension, sound vibrations, and internally the
position and posture of the body
...
Generation and transmission:
Nerve cells contain positively charged ions of
sodium and potassium and negatively charged
protein molecules
...
It must cross a certain threshold to be
stimulated
...
Crossing the gap – synapses
At the end of an axon branch
there is a knob which have a lot
of mitochondria and bubbles
called synaptic vesicles
...
These knobs secrete
neurotransmitters which carry
the impulse across the gap
...
Title: The Nervous System
Description: Great, clear, easy to understand notes on the workings of the Nervous system
Description: Great, clear, easy to understand notes on the workings of the Nervous system