Question

Long Answer Question:
Define receptors.Enlist different type of receptors.

Answer 1

• A receptor is a cell, tissue or an organ that is able to identify and respond to a certain stimulus. This stimulus could be internal or external.
  
• Sensory receptors can be classified on the basis of the stimuli that they can respond to-
  

1. Chemoreceptors– These receptors respond to chemical stimuli like hormones, enzymes, etc.
   
2. Thermoreceptors– These receptors respond to changes in the temperature.
   
3. Mechanoreceptors– These receptors are sensitive to pressure.
   
4. Photoreceptors– These receptors respond to light.