The image illustrates the
reflex arc, which is a neural pathway that controls a reflex action. Reflex actions are rapid, automatic responses to stimuli without involving conscious thought. The diagram shows how a person withdraws their hand quickly when touching something hot (e.g., a flame).
Reflex Arc Components:
1.
Receptor: Detects the stimulus.
2.
Sensory Neuron: Carries the signal from the receptor to the spinal cord.
3.
Interneuron: Processes the signal within the spinal cord.
4.
Motor Neuron: Carries the signal from the spinal cord to the muscle.
5.
Related Muscle: Contracts or relaxes in response to the signal.
6.
Stimulus: The external factor that triggers the reflex action.
Solution:
Based on the diagram and the flow of the reflex arc, the correct sequence is as follows:
1.
STIMULUS (The flame causes heat, which is the initial trigger.)
2.
RECEPTOR (Nerve endings in the skin detect the heat.)
3.
SENSORY NEURON (Carries the signal from the receptor to the spinal cord.)
4.
INTER NEURON (Processes the signal within the spinal cord.)
5.
MOTOR NEURON (Carries the signal from the spinal cord to the muscle.)
6.
RELATED MUSCLE (Muscles contract to move the hand away from the heat.)
Final Answer:
```
1. STIMULUS
2. RECEPTOR
3. SENSORY NEURON
4. INTER NEURON
5. MOTOR NEURON
6. RELATED MUSCLE
```
This sequence represents the flow of information and action in a reflex arc.
Parent Tip: Review the logic above to help your child master the concept of reflex arc worksheet.
