The kidneys are the main organs of the urinary system. They function chiefly to filter blood in order to remove wastes and excess water. The waste and water are excreted as urine. The kidneys also reabsorb and return to the blood needed substances, including amino acids, sugar, sodium, potassium, and other nutrients.
But many popular brands actually contain considerably less than an old-fashioned cup of black coffee. An 8.4-ounce serving of Red Bull, for instance, has a relatively modest 76 to 80 mg of caffeine, compared to the 95 to 200 mg in a typical cup of coffee, the Mayo Clinic reports.
4. The average size of a coffee cup is 9 ounces and coffee drinkers average about 3 cups of coffee per day. The average price for a cup of brewed coffee is $1.38.The average price for an espresso-based drink is $2.45. 5. While Brazil leads the way in coffee production â the South American country produces an estimated 30 percent of the worldâs coffee, Nordic countries lead the way in consumption per capita.he average size of a coffee cup is 9 ounces and coffee drinkers average about 3 cups of coffee per day. The average price for a cup of brewed coffee is $1.38.