How the brain sends signals LO2: To label and define the parts of a neuron to understand how the brain sends signals.

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How the brain sends signals LO2: To label and define the parts of a neuron to understand how the brain sends signals.

How does a neuron work? Label the neuron with the following features: 1)Cell body 2)Dendrites 3)Axon 4)Terminal buttons

Biology revision… Key wordDefinition Neuron A cell in the body, including the brain, that sends information using both electrical and chemical processes. Axon The ‘cable’ that leads from a cell body of a neuron down to the terminal buttons that hold the neurotransmitter. Impulse The electrical signal that travels from the cell body of a neuron to the terminal buttons, where it releases a neurotransmitter. Neurotransmitter A chemical at the terminal button of a neuron, which is released by the impulse and then goes into the synaptic gap. Synaptic gap The gap between the dendrites of one neuron and the next. Synaptic transmission What happens when a neurotransmitter released by an impulse of one neuron goes across the synaptic gap and is taken up at the dendrites of another neuron. Task: Match the following key words (Axon, Neurotransmitter, Synaptic transmission, Neuron, Impulse and Synaptic Gap) to the definitions below. Copy the table into your exercise books.

Neurons Neurons are cells in the nervous system that send information, using chemical and electrical signals. Messages in the brain are sent using electrical impulses and chemicals that are called neurotransmitters.  Task: In groups, write a list of stages required for how brain messages are sent using neurons.  Use the diagram of the neuron to help you and try to use all of the key words covered so far.