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They are glands that secrete their product (hormone) into the blood in a direct manner. There are 8 endocrine glands in the endocrine system and they perform similar functions...

No matter what the cause of nasal congestion or a stuffy nose, the condition is more of an annoyance and irritation than anything else. Although not initially serious in itself, the problem can eventually give rise to other dilemmas as it takes its toll on the amount of, and quality of sleep you can get...