4.5.2 the human nervous system Flashcards
Where do sensory neurones carry electrical impulses from and to?
From receptors to the CNS
Where do motor neurones carry electrical impulses from and to?
From the CNS to the effector (muscle or gland)
What is a relay neurone?
A short neurone that carries an electrical impulse around the CNS in a reflex action
Where do you find a synapse?
The small gap between the axon of one nerve and the dendrites of another
Which type of chemical moves across a synapse
Neurotransmitter
What is a reflex response
an automatic response that you do not have to think about (involuntary)
How many neurones make up an reflex arc?
Three
Why are reflex actions beneficial?
Prevent us from harm. Do not have to be learned.
How do neurotransmitters travel across a synapse
by diffusion
What comes next?
stimulus –> receptor–> ?
Sensory neurone
What comes next?
CNS (co-ordinator)—> motor neurone —> ?
Effector
