Question 50
What are reflex actions? Give two examples. Explain a reflex arc.
Question 50
What are reflex actions? Give two examples. Explain a reflex arc.
A quick, sudden, immediate response of the body to the certain stimuli that mostly involves spinal cord and the spinal nerves.
For example: when our hand touches a very hot electric iron, we move away our hand with a jerk.
Reflex Arc: The path through which nerve signals involved in a reflex action travel is called the reflex arc. The following flowchart shows the flow of the signal in a reflex arc.
Receptor → Sensory neuron → Relay neuron → Motor neuron → Effector (muscle)
The receptor is an organ which comes in contat with the danger zone. The sensory neurons pick signals from the receptor and send them to the relay neuron. The relay neuron is present in the spinal cord. The spinal cord sends signals to the effector via the motor neuron. The effector comes into action moves the receptor away from the danger.
A quick, sudden, immediate response of the body to the certain stimuli that mostly involves spinal cord and the spinal nerves.
For example: when our hand touches a very hot electric iron, we move away our hand with a jerk.
Reflex Arc: The path through which nerve signals involved in a reflex action travel is called the reflex arc. The following flowchart shows the flow of the signal in a reflex arc.
Receptor → Sensory neuron → Relay neuron → Motor neuron → Effector (muscle)
The receptor is an organ which comes in contat with the danger zone. The sensory neurons pick signals from the receptor and send them to the relay neuron. The relay neuron is present in the spinal cord. The spinal cord sends signals to the effector via the motor neuron. The effector comes into action moves the receptor away from the danger.
