Amy is cooking dinner for her family. She moves to pull a pot off the stove and

Question

Amy is cooking dinner for her family. She moves to pull a pot off the stove and accidently touches the burner. She reflexively pulls her finger away from the stove and immediately feels the pain.

Which receptor neuron is responsible for sending information from her finger to her peripheral nervous system?

Is this receptor neuron, an afferent or efferent neuron?

Explain where the information from the receptor neuron is sent and how does it result in Amy moving her finger away from the stove.

How many neurons are typically involved in this response? What are the names of these neurons?

Evolutionarily, why do you think the human body has this system in place?

What might happen if we did not have this response?

Explanation / Answer

Sensory receptors which are present on the skin sent the information from the skin.

It is afferent as the neurons are able to sense stimulus and carry information to CNS transmitted from the sensory organs. (Skin of finger in this case).

The sensory receptors present in the finger have pain sensory. This travels to the CNS. The brain then sends a back signal to PNS through efferent neurons which tells muscle to pull back from hot stove. This is all involuntary response and reaction time is in seconds.

Evolutionary the system is present to prevent human body from irreversible damage. The system helps in prevention of damage.

If we did not have this response then we may not be able to prevent ourselves from harm and not be able to survive certain situations.

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