Question

A bee stings a woman on the arm, and she pulls her arm away instantly. describe the reflex arc that happened in her body.

Answer 1

Upon feeling a sharp pain, impulses from a sensory receptor in the skin pass along a sensory neuron to the central nervous system.
-The neuron enters the spinal cord through the dorsal root.
-When an impulse from the sensory neuron arrives in the synapse with a short relay neuron, a transmitter is released which causes an impulse to be sent along the relay neuron.
-When the impulse reaches the synapse between the relay neuron and a motor neuron returning to the arm again and another transmitter chemical is released. 
-In this example the impulse travels in the hand muscles of the upper arm, causing them to contract and move your hand away sharply. 

Answer 2

A reflex arc occurs when a person has an involuntary and fast response to a stimulus. These reactions are extremely important as they allow a person to respond to a threat quickly to minimize damage. The reflex arc that happened in this case would look something like this:

• First, a receptor in the skin of a woman reacted to the stimulus of the bee sting.
• Then, the sensory neuron communicates with the relay neuron, which allows the information to be passed to a motor neuron.
• After, the motor neuron send electrical impulses to an effector.
• Finally, the effector allows the muscles to contract, which enable the woman to move her hand away.