We know that the human body is a system which is comprised of various types of organs.
The health of body can be in best if all the vital organs of the body are in best condition
These organs have specific and important roles to play and in the absence of their functioning, normal body functions cannot be carried out.
There are various reasons like aging, accidents, infections, disorders because of which an organ may become non functional.
Some of the organs can be brought back to functionality by performing surgeries.
Brain, kidney, heart, liver, etc. are some such vital organs which are most essential for proper metabolism and functioning of the body. The sense organs of the body are also of utmost importance, especially eyes.
Valuable organs like Heart, kidney, eyes, liver etc. can be donated after death to save and increase the life of other people.
Some of the organs like brain will never regenerate too.
Any problem with these vital organs makes the life miserable therefore they are said to be valuable.