Page 81 - Teknik Menjawab Soalan PSPM Biologi

Compare Impulse Transmission Along Axon & At Synapse

At synapse Along the axon

Occurs between 2 neurons / between Occurs along axon of a single

presynaptic neuron & potsynaptic neuron neuron

Impulse is chemically transmitted Impulse is electrically transmitted

Involves neurotransmitters No neurotransmitters involved

Speed of impulse transmission is Speed of impulse transmission is

relatively slower relatively faster

Involves the diffusion of Ca 2+ into Does not involves the diffusion of
the presynaptic neuron Ca 2+ into axon

Involves ligand gated ion channels Does not involves ligand gated ion channels but

+
+
involves voltage gated Na and K ion channels
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