Creating a reflex arc working model for a science project exhibition can be both educational and interactive.
![](https://howtofunda.com/wp-content/uploads/2024/02/reflex-arc-working-model-1024x576.png)
Here’s how you can make one using cardboard to create a human body with a hand, colored paper for fire, and simulated alarm and light in the brain area:
Materials Needed:
- Cardboard
- Colored paper (red, yellow, orange for fire)
- LEDs or small lights
- Buzzer or alarm module
- Wires
- Battery or power source
- Switch or sensor (for hand-touch activation)
- Hot glue gun or adhesive
- Markers or paints for decoration
- Scissors
- Optional: additional decorative materials (e.g., cotton for clouds)
Step by Step Instructions:
- Create the Human Body Model:
- Cut out a large piece of cardboard to represent the human body.
- Draw and cut out the shape of a hand on one end of the cardboard body.
- Make the Fire:
- Cut out flame shapes from colored paper (red, yellow, and orange).
- Arrange the flame shapes on another piece of cardboard to represent fire. This will be placed near the hand later.
- Construct the Brain Area:
- Cut out a cardboard shape to represent the brain area. This can be a simplified version of the brain’s structure.
- Attach LEDs or small lights inside the brain area to simulate brain activity. These lights will be activated when the reflex arc is triggered.
- Add the Alarm System:
- Attach a buzzer or alarm module to the brain area using adhesive.
- Connect the buzzer to a power source and a switch or sensor. This switch or sensor will be activated when the reflex arc is triggered by the hand touching the fire.
- Assemble the Model:
- Arrange the cardboard body, fire, and brain area on a stable base or platform.
- Place the fire near the hand of the cardboard body.
- Position the brain area above the body, near the head region.
- Connect the Components:
- Connect the LEDs or lights in the brain area to the power source.
- Connect the buzzer or alarm module to the power source and the switch or sensor.
- Test the Model:
- Ensure that all components are properly connected and secured.
- Activate the switch or sensor by touching the hand to the fire.
- Observe the lights in the brain area lighting up and the buzzer or alarm sounding off, simulating the reflex arc response
By following these steps, you can create a working model of a reflex arc for your science project exhibition. This model demonstrates the basic concept of reflex actions in the human body in response to stimuli.