Signals in the Nervous System
12th Grade · Science · 99 min
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Learning Objective
I can describe how the nervous system sends signals throughout the body.
- 1
Neurons convert information from our environment into electrical signals that are carried to the brain.
- 2
Each neuron has a cell body with smaller branches called dendrites that receive signals, and a longer branch called an axon that transmits signals.
- 3
A neuron fires a nerve impulse only when the total sum of input signals crosses a threshold potential of -55mV, causing depolarization of the neuron.
