894185
Beschreibung
Reflex actions
and synapses
- Some responses to stimuli are automatic
and rapid and are called 'Reflex Actions'.
- Reflex actions help us to
avoid danger and harm
- 1. Sensory neuron
2. Relay neuron..
3. motor neuron.
- The synapse job is to send the
electrical impulses to the
dendrite of the next neuron.
- The electrical impulses
pass through the presynaptic
membrane and diffuses
through the gap to the
post-synaptic membrane.
- CNS - Central nervous system
- The dendrite detects the signals from the
other neurons then the axon is the long part
of the neuron which carries the signals to
the synapse whilst this is happenin the
myelin which surrounds the axon insulates
the axon and increases the speed of the
impulse travelling down the axon. When the
axon has sent the impulses to the synapse
the synapse releases chemicals whichare
detected by the dendrite of another neuron.
- Ears, eyes, skin are all sensory organs
which are made up of receptors.
- Stimuli - changes in the environment, pressure, noise...
Medienanhänge
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