Ch29 human nervous system Flashcards
1
Q
neuron
A
a nerve cell
2
Q
motor neuron
A
is a nerve cell that carries messages form the CNS to an effector
3
Q
sensory neuron
A
nerve cell that carries nessages to the CNS from a sense organ
4
Q
interneuron
A
carries messages between nerve cells
5
Q
threshold
A
the minimum stimulation required to send a messade along a neuron
6
Q
synapse
A
the region where two neurons meet
7
Q
synaptic cleft
A
gap between two neurons
8
Q
neurotransmitter
A
chemical that carries a nerve message across a synapse
9
Q
grey matter
A
part of the CNS that contains cell bodies and has a darker colour
10
Q
white matter
A
part of the CNS that contains the axons and has a lighter colour
11
Q
reflex action
A
unthinking response to a nerve stimulus
12
Q
reflex arc
A
the nerve pathway of a reflex action
