🧠 Part 1: Nervous System Components

1. Circle the THREE main parts of the nervous system:

Brain

Heart

Spinal cord

Lungs

Nerves

Stomach

2. What is the main function of the nervous system?

To pump blood around the body

To communicate and control body functions

To digest food

To help us breathe

3. Fill in the blanks about nervous system roles:

The __________ is the control centre for voluntary and involuntary actions. The __________ __________ acts as a communication highway between the brain and body. __________ transmit electrical signals to and from different body parts.

⚡ Part 2: Reflex Actions

4. What is a reflex action?

5. Circle examples of reflex actions:

Pulling your hand away from a hot stove

Writing your name

Blinking when something comes near your eye

Choosing what to eat for lunch

Knee-jerk response when tapped

Reading a book

6. Put the steps of a reflex arc in the correct order by matching:

1. First step

2. Second step

3. Third step

4. Fourth step

5. Fifth step

A. Motor neuron carries signal

B. Stimulus detected

C. Response occurs

D. Spinal cord processes signal

E. Sensory neuron carries signal

7. Why are reflex actions important for survival?

🔬 Part 3: Neuron Structure

8. Draw and label your neuron model in the space below. Include: cell body, dendrites, axon, and axon terminals.

9. Match each neuron part with its function:

1. Cell body (soma)

2. Dendrites

3. Axon

4. Axon terminals

5. Myelin sheath

A. Carries signals away from cell body

B. Contains the nucleus and controls cell

C. Receive signals from other neurons

D. Insulates axon and speeds up signals

E. Release chemicals to next neuron

10. How do electrical impulses travel through a neuron?

From axon terminals to dendrites to cell body to axon

From dendrites to cell body to axon to axon terminals

From cell body to dendrites to axon to axon terminals

Randomly in all directions

🧪 Part 4: Model Building Reflection

11. Describe the materials you used to build each part of your neuron model:

Cell body: ________________________

Dendrites: ________________________

Axon: ________________________

Axon terminals: ________________________

12. Explain how neurons connect to each other to send messages through the nervous system:

13. Why is the nervous system called the body's "communication network"?

14. Extension: Research and explain what happens to nerve signals when the myelin sheath is damaged (such as in multiple sclerosis):

Nervous System Model Building

Nervous System Model Building

🧠 Part 1: Nervous System Components

⚡ Part 2: Reflex Actions

🔬 Part 3: Neuron Structure

🧪 Part 4: Model Building Reflection

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