Summary
The reflex arc is a neural pathway that controls a reflex action. It involves sensory neurons, interneurons, and motor neurons to produce a quick response to a stimulus.
- Reflex Arc — the neural pathway that controls a reflex action Example: The knee-jerk reaction is controlled by a reflex arc.
- Sensory Neuron — a nerve cell that transmits sensory information Example: Sensory neurons carry signals from the skin to the spinal cord.
- Interneuron — a neuron that connects sensory and motor neurons Example: Interneurons in the spinal cord process the reflex signal.
- Motor Neuron — a nerve cell that transmits signals to muscles Example: Motor neurons cause muscles to contract in response to a reflex.
Exam Tips
Key Definitions to Remember
- Reflex Arc
- Sensory Neuron
- Interneuron
- Motor Neuron
Common Confusions
- Confusing sensory neurons with motor neurons
- Misunderstanding the role of interneurons
Typical Exam Questions
- What is a reflex arc? A reflex arc is the neural pathway that controls a reflex action.
- How do sensory neurons function in a reflex arc? Sensory neurons transmit sensory information to the spinal cord.
- What role do motor neurons play in reflex actions? Motor neurons transmit signals to muscles to produce a response.
What Examiners Usually Test
- Understanding the sequence of events in a reflex arc
- Identifying the roles of different types of neurons in a reflex action