Wiktionary (0.00 / 0 votes) Rate this definition: electromagnetic spectrum (Noun). The entire range of wavelengths of all known electromagnetic radiations extending from gamma rays through visible light, infrared, and radio waves, to X-rays.
Excessive alcohol can damage the immune system because the alcohol will prevent nutrients from feeding your immune system. The alcohol is absorbed into your bloodstream through your stomach. Once in the bloodstream, alcohol will reduce the white blood cell count in the body.
But how alcohol effects blood vessels is much more complex but it seems it's due to it's effects on the functioning of the nervous system. I'll have to quote rather than try and explain because i can't say i totally understand extactly how this all works: Alcohol is a central nervous system depressant.