Question

---------------- is the only body part that doesn't feel pain. (While writing answers use small letters only)

Answer 1

Answer:

brain

Explanation:

this is your answer

Answer 2

Answer:

Which part of the human body cannot feel pain?

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There are parts of the body that do not have pain receptors, or only feel certain kinds of of sensations as painful. As far as I know they are internal. For example I believe the brain itself does not have pain receptors, but its linings do, so cutting brain tissue doesn't hurt (Caveat… depends on the function of the area of the brain…motor area, sensory area etc).

There are limited situations where intestines themselves send pain signals… I think most commonly when the bowel is stretched… not necessarily when it is cut. However like the brain, tissues surrounding the bowels, the lining or the peritoneal cavity is pain sensitive.

The lungs are largely the same… most lung tissue is not sensitive to pain, parts of the larger bronchi are, and possibly some blood vessels… but the lining of the lungs… the pleura can get really painful.

The internal organs often when they do “feel” pain it is often not well localised, and can even be interpreted by our body as coming from a different location. This phenomenon is known as referred pain. There are common areas where pain for different organs or structures tend to be reffered, but there can be a lot of individual variation which can make diagnosing a problem a bit tricky.

A common example of referred pain is that pain generated in the diaphragm and structures close to it is usually felt as shoulder tip pain. The nerve that carries pain signals from the shoulder tip area, usually joins up with sensory nerves around the diaphragm internally.

During a heart attack reffered pain is commonly felt radiating up the neck from the left shoulder and down the left arm… but not in everyone, some people get a sensation like severe indigestion, pain in the back, chest, or pain in both or neither arms, even no pain at all. This in part reflects individual variation in how structures are innervated.

At a more general level you can get an idea of how sensitive a body part is, by looking at the amount of the cerebral cortex dedicated to interpreting sensation (not all sensation is pain, so it is not straight forward).

Explanation:

Hope this helps uh