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The diagram below shows neuron and the direction of nerve impulse through it. Observe the diagram and answer the questions.

a. If there is a mistake in the direction of nerve impulse, redraw the diagram and correct it. 

b. How does the impulse pass through the part X?

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b. When electric impulses from the axon reach the synaptic knob, certain chemical substances are secreted from there to the synaptic cleft. These chemical substances are called neurotransmitters. They stimulate the adjacent dendrite or cell and new electric impulses are generated.

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