Lecture notes
Class notes Neuronal Communication 5.3.2
- Module
- 5.3 Neuronal communication
- Institution
- OCR
Biology OCR A-Level notes written in class with reference to Year 2 Biology OCR A-Level textbook
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Structure and function of neurones 5.3.2Function of neurones
Motor neurones
Carry an action potential from central nervous system to an effector
Sensory neurones
Carry the action potential from a sensory receptor to the CNS
Relay neurones
Connect sensory and motor neurones
Structure of neurones
Specialised features
o Very long So can transmit action potential over long distance
o many gated ion channels to control entry or exit of Na + K ions
o Na/ K pumps use ATP to actively transport Na ions out and K ions into the cell
o Neurones maintain potential difference across cell surface membrane
o Cell body contains many mitochondria
o Numerous dendrites to connect neurones to carry impulses
o Surrounded by fatty layer (myelin sheath) to insulate the cell from electrical activity
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