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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
The familiar sounds of your heart are made by the heart's valves as they open and close.