The captured Africans were held in forts, sometimes called 'slave castles', along the coast. They remained there for months until finally leaving their homeland for an unknown destination on board European merchant ships, including those of the British Royal African Company.
Key Points. 1  The majority of fluid output occurs from urination. Some fluid is lost through perspiration (part of the body's temperature control mechanism) and as water vapor in expired air. 2  The body's homeostatic control mechanisms ensure that a balance between fluid gain and fluid loss is maintained.
The urinary system filters waste from the blood and produces urine in the kidneys; then it removes the urine from the body. Adults produce about a quart and a half of urine every day, but that amount can vary greatly depending on how much fluid and what types of foods are consumed and how much fluid is lost by sweating or breathing.