Arkansas Esthetician Practice Exam

What are nerve cells that react to external stimulation by sending sensory messages to the brain called?

1. Ganglia

2. Synapses

3. Neurotransmitters

4. Receptors

The correct answer is: Receptors

Nerve cells that react to external stimulation are known as sensory receptors. These cells are specialized to detect various types of stimuli such as light, sound, temperature, and touch, and then convert the stimuli into electrical signals that are sent to the brain. This process allows us to perceive the world around us. The other options listed are not the correct answer because - Ganglia are clusters of nerve cells that are primarily involved in coordinating motor signals to the body. - Synapses refer to the junctions between nerve cells where neurotransmitters are released. - Neurotransmitters are chemical messengers that transmit signals between nerve cells. They do not react to external stimuli themselves, but instead help to transmit signals from sensory receptors to the brain.