Psychology: How the Brain Works: Neurons and Signals Worksheet

Question 1

What is a neuron, and why is it important for the nervous system?

Accepted Answer

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.

Question 2

Name the three main parts of a neuron: dendrites, cell body, and axon. Describe the job of each part.

Accepted Answer

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.

Question 3

A student touches a hot pan and quickly pulls their hand away. Explain how neurons help this reaction happen.

Accepted 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.

Question 4

What is an electrical impulse in a neuron?

Accepted Answer

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.

Question 5

What is a synapse, and what happens there?

Accepted Answer

A synapse is the tiny gap between two neurons. At the synapse, chemicals called neurotransmitters carry the message from one neuron to the next.

Question 6

Explain the difference between an electrical signal and a chemical signal in neuron communication.

Accepted Answer

An electrical signal travels inside a neuron along the axon. A chemical signal uses neurotransmitters to cross the synapse between neurons.

Question 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.

Accepted Answer

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.

Question 8

Why does the brain need many neurons working together instead of just one neuron doing everything?

Accepted Answer

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.

Question 9

A diagram shows a neuron with a long axon covered by myelin. What is the job of myelin?

Accepted Answer

Myelin is a protective covering around some axons. It helps electrical signals travel faster and more efficiently along the neuron.

Question 10

How are sensory neurons and motor neurons different?

Accepted Answer

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.

Question 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.

Accepted Answer

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.

Question 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.

Accepted Answer

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.

Psychology: How the Brain Works: Neurons and Signals

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