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Theory:

Jo Cameron, a lady who has a rare genetic mutation, makes her feel virtually no pain. She never feels anxious or afraid in a painful situation. Her condition was discovered when she had surgery on her hand; doctors found that she didn't need painkillers after surgery.
 
So, what do you think about her condition? Why does it happen to her? The part of our body which make all of us sense pain is not functioning in her body.
Do you know what that part is responsible for sensing the pain?
 
receptors.jpg
Picture explaining the pain knowing neurons
 
They are called pain receptors. They are a type of sensory neuron with specialised nerve terminals found throughout the body, including the skin, deep tissues (such as muscles and joints), and most visceral organs.
 
Similar to pain receptors, there are many other receptors, which can be found throughout our body. These receptors help us see, smell, taste, hear, sense the touch, sense the temperature, etc.
  • Receptors are specialised tips of the nerve cells that detect information around our external environment by means of a stimulus and create an impulse into the nervous system, which results in the nervous system taking action.
  • These receptors are situated in the sense organs such as eyes, nose, tongue, ears and skin.
The receptors are the specialised ends of a nerve cell or a group of nerve cells that collect information about environmental changes in stimuli.
 
  • Sensory neurons, a type of nerve cell, transmit information from the receptors to the brain.
  • Sensation refers to the impulses that flow from the receptor to the brain through the sensory neuron. This feeling is analysed and interpreted as perception in the brain.
  • Motor neurons are a type of nerve cell that transmits information from the brain to the effector organ.
  • Muscles and glands are the primary effectors, producing appropriate reactions.
 
Nerv5w769.jpg
The action of sensory and motor neuron
       
Animals receive external information through a specialised system or organ known as the sense organs or receptors organ. Human beings have five different sensory organs. The following is a list of them.
 
 
five-human-feelings_81894-2883.jpg
Five senses concepts with human organs
 
Location of the receptor
Name of Receptor
Stimulus
Eyes
Photo receptor 
 Light
Ears
Phono receptor
Sound
Nose
Olfactory receptors
Smell
Tongue
Gustatory receptors
Taste
Skin
Tango receptor
Thermo receptor
Touch
Heat/cold
All over the body
Algesireceptors
Pain
Internal ear
Statoreceptors
Acceleration/gravity
All over the body
Nociceptors
Pain
 
The video explaining the types of receptors and sensory receptors
Reference:
https://www.freepik.com/premium-vector/five-human-feelings_5331753.htm
https://upload.wikimedia.org/wikipedia/commons/3/37/1225_Chemical_Synapse.jpg
http://hiscience.pbworks.com/w/page/123385353/1%20BACH%20FEBRERO%202018