neurones Flashcards
What is the nervous pathway
Receptor -> sensory neuron -> relay neuron at the CNS -> motor neuron -> effector
What is a dendron
Sends impulses to the cell body
What is a cell body
Releases neurotransmitters and contains a nucleus
What is the axon
Sends impulses away from the cell body
What is the myelin sheath
Lipids that insulate the axon and increase speed of transmission
what are sensory neurons responsible for
transmit nerve impulses from receptors to the CNS
what are motor neurons responsible for
transmit nerve impulses from the CNS to effectors
what are relay neurons responsible for
transmit nerve impulses between sensory and motor neurons
what is a stimulus detected by
receptor cells
what happens when a stimulus is detected
a nerve impulse is sent down a sensory neuron
what happens when a nerve impulse reaches the end of a neuron
neurotransmitters take the message along to the next neuron
what is a transducer
converts the energy of a stimulus into electrical energy
what are the specific features of sensory neurons
one long dendron which carriers the action potential to the cell body
cell body in the middle of the neuron, and a short axon carrying action potential to the CNS
what are the specific features of motor neurons
cell body is located in the CNS, long axon to carry action potential to effector
what are the specific features of a relay neuron
many short dendrites and a short axon to send communications from the sensory neuron to the motor neuron
