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Head / neck
every part of the body senses change, but if the question means which part senses first, the answer is the heart.
Your hair
Ultraviolet radiations are part of EM waves. It affects humans by causing various diseases.
your heart and brain but really every part of you body is very important
Any part of the body where skin is exposed will capture ultraviolet and infrared energy
Skull bones protect your brain.
Every part of the body is vulnerable
skin
A suntan is caused by the release of the pigment Melanin in the skin. This is the body's defensive response to harmful Ultraviolet radiation that makes up part of the Sun's rays. Ultraviolet is part of the Electromagnetic Spectrum.
the spinal cord
the head
Eyelids and Eyelashes.
Its exoskeleton.
Your hands! :P
by wings
scales