People use their eyes to see. The eyes contain structures such as the cornea, iris, lens, and retina that work together to process light and create visual images that are sent to the brain for interpretation.
Appendix
The skin is the sense organ we primarily use for the sense of touch or feel. It contains various receptors that detect pressure, temperature, and pain, sending signals to the brain for interpretation.
If you are discussing live organ donation, such as part of the liver or a kidney, and you are medically expected to need such a donation at some point, then yes your friend can be tested for matching to you prior to the need for a donated organ.
Most professionals believe the appendix is vestigial, or not used.
Countries that use an opt-out system for organ donation include Spain, Belgium, Austria, and Argentina. In these countries, individuals are presumed to consent to organ donation unless they specifically choose to opt out.
Eyes
On avergage how many people in the United States will need an organ transplant? On average how many people in the world will need a organ transplant? Why is selling a organ illegal?
the organ is the loin.
The heart is one organ associated with the circulatory system.
eye
They use a microscope
The organ in the body that lets you see is the eye. This is controlled by the optical nerves which are found in the brain.
A vestigial organ is one having no known use.
I just love the sound of a pipe organ.
Integumentary system
Because the use there eyes.
Their tongue and the Jacobson's organ.