Neuronal Communication Flashcards
Cell signalling?
One cell or group of cells communicating with others
Effector?
An organ that becomes active in response to a nerve impulse
Transducer?
Something that changes one form of energy into another
What direction does the impulse travel in the motor neurone?
Away from the central nervous system to an effector
Do all neurones have dendrites?
Motor neurones have dendrites, sensory neurones don’t
What direction does an impulse travel in sensory neurones?
Travels towards the central nervous system from a sensory receptor
What are relay neurones?
Have short axons which transmit signals from one neurone to another in the central nervous system
Why do some neurones have no myelin sheath?
When impulses only have to travel a very short distance myelination is unnecessary, they have bare axons
Which neurones have axon terminals?
Both motor and sensory neurones
Where is the cell body in motor neurones?
At one end of the cell
Where is the cell body in sensory neurones?
In the middle of the axon
Electrical potential?
A form of potential energy resulting from behaviour of charges particles , such as their unequal distribution across a membrane
How does an impulse start?
Starts in a neurone when the resting potential is converted into an action potential
What is the stimulus in a neurone?
An electrical impulse from another neurone or a chemical change around the membrane
What does the stimulation of a neurone cause?
The voltage-gated sodium ion channels start opening
