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.
Fluid Balance. Water for the body comes from both liquids and food. Water is lost mostly through urine, but also through evaporation from the skin when sweating, the respiratory tract and in feces. When water intake is high, the kidneys produce larger amounts of urine to help maintain a balance. When the body is losing water, the kidneys will try to conserve water by producing a small amount of concentrated urine.