Signals in the Nervous System
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Objective
I can describe how the nervous system sends signals throughout the body.
Part 1 of 4
Warm-up video
Science ABC · 7:01Vetted channel
We don't generate video — this one is by Science ABC on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 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.
Part 3 of 4
Practice
12 questions
What is the primary function of neurons?
Which of the following best describes an action potential?
Part 4 of 4
Exit ticket
Quick comprehension check
“Describe the process by which a neuron generates a nerve impulse, including the roles of ion channels, depolarization, repolarization, and hyperpolarization.”
Sample answer included in the free materials
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