Psychology: How the Brain Works: Neurons and Signals
Exploring neurons, synapses, and messages in the nervous system
Psychology: How the Brain Works: Neurons and Signals
Exploring neurons, synapses, and messages in the nervous system
Psychology - Grade 6-8
- 1
What is a neuron, and why is it important for the nervous system?
Think of neurons as tiny message carriers in the body.
A neuron is a specialized nerve cell that sends and receives messages. Neurons are important because they help the brain, spinal cord, and body communicate. - 2
Name the three main parts of a neuron: dendrites, cell body, and axon. Describe the job of each part.
Dendrites receive messages from other neurons. The cell body controls the neuron and keeps it alive. The axon carries the message away from the cell body to other neurons or body parts. - 3
A student touches a hot pan and quickly pulls their hand away. Explain how neurons help this reaction happen.
Include sensory neurons, the spinal cord or brain, and motor neurons in your answer.
Sensory neurons detect the heat and send a message to the spinal cord and brain. Motor neurons then send a message to the muscles, causing the hand to pull away quickly. - 4
What is an electrical impulse in a neuron?
An electrical impulse is a fast signal that travels along a neuron. It moves down the axon and helps carry information from one part of the nervous system to another. - 5
What is a synapse, and what happens there?
A synapse is a space, not a solid bridge.
A synapse is the tiny gap between two neurons. At the synapse, chemicals called neurotransmitters carry the message from one neuron to the next. - 6
Explain the difference between an electrical signal and a chemical signal in neuron communication.
An electrical signal travels inside a neuron along the axon. A chemical signal uses neurotransmitters to cross the synapse between neurons. - 7
Put these steps in the correct order: neurotransmitters cross the synapse, dendrites receive the message, an electrical signal travels down the axon, neurotransmitters are released from the axon terminal.
Follow the direction a message usually travels through one neuron and toward the next neuron.
The correct order is: dendrites receive the message, an electrical signal travels down the axon, neurotransmitters are released from the axon terminal, and neurotransmitters cross the synapse. - 8
Why does the brain need many neurons working together instead of just one neuron doing everything?
The brain needs many neurons because different neurons handle different jobs and connect in networks. Working together lets the brain process senses, thoughts, movements, memories, and emotions. - 9
A diagram shows a neuron with a long axon covered by myelin. What is the job of myelin?
Myelin works a little like insulation around a wire.
Myelin is a protective covering around some axons. It helps electrical signals travel faster and more efficiently along the neuron. - 10
How are sensory neurons and motor neurons different?
Sensory neurons carry information from the senses to the brain or spinal cord. Motor neurons carry messages from the brain or spinal cord to muscles or glands to cause an action. - 11
Imagine a person hears their name called, turns their head, and looks toward the sound. Describe a simple path of signals in the nervous system for this action.
Start with the sense organ, then include the brain, then include the muscles.
Sound is detected by sensory cells in the ears, and sensory neurons send signals to the brain. The brain processes the sound, then motor neurons send signals to neck and eye muscles so the person turns and looks. - 12
Look at a simple brain diagram with areas labeled for movement, touch, vision, hearing, and thinking. Explain why different brain areas may be active during different activities.
Different brain areas have different jobs, so they become active depending on what a person is doing. For example, the vision area is active when looking at something, while the movement area is active when moving the body.