Neurons (Grade 12 NSC Matric Life Sciences): Flashcards
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Neurons
Neurons
Specialised cells forming nervous system building blocks
Dendrite function
Dendrite function
Receive signals & carry towards cell body
Axon function
Axon function
Carry nerve impulses away from cell body
Myelin sheath role
Myelin sheath role
Insulates axon, speeds up impulses, ensures efficiency
Sensory neurons signal direction
Sensory neurons signal direction
From receptors towards CNS
Motor neurons signal direction
Motor neurons signal direction
Away from CNS to effectors (muscles/glands)
Interneurons location
Interneurons location
Within CNS only
Synapse
Synapse
Functional connection point between neurons with a gap
Neurotransmitters
Neurotransmitters
Chemical messengers released at synapses
Neuron signal flow direction
Neuron signal flow direction
Dendrites → cell body → axon → axon terminals