The Three Types of Neurons Flashcards
What are the three types of neurones?
Sensory neurons.
Relay neurons.
Motor neurons.
What do sensory neurons do?
Carry nerve impulses from sensory receptors to the spinal chord and brain.
Convert information from these sensory receptors into neural impulses.
What are some example of sensory receptors that sensory neurons carry impulses from?
Receptors for vision, taste and touch.
Where are sensory receptors found within the body?
In various locations, for example in the eyes, ears, tongue and skin.
Once a sensory neuron has converted and carried information from the sensory receptors to the brain?
The neural impulses are translated into sensations, for example, visual input, heat, pain.
Not all sensory information reaches the brain, where do some neurons terminate?
In the spinal chord.
When sensory information terminated in the spinal chord rather than reaching the brain, what does it allow?
Reflex actions to occur quickly without the delay of sending impulses to the brain.
What do relay neurons allow?
Communication between sensory and motor neurons.
Where are relay neurons found?
In the brain and spinal chord.
What are motor neurons?
Neurons food in the central nervous system that project their axons outside the central nervous system and directly or indirectly control muscles.
What to motor neurons form with muscles to control contractions?
Synapses.
What happens when a motor neuron is stimulated?
It releases neurotransmitters that bund to receptors on the muscle and leads to muscle movement.
What happens when the axon of a motor neuron fires?
The muscle which it has formed synapses with contracts.
What does the strength of a muscle contraction depend on?
The rate of firing of the axons of the motor neurons that control it.
What is muscle relaxation caused by?
Inhalation of the motor neuron.
