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.
C. Regulation of Water Output. 1  Obligatory water losses - insensible water loss from lungs and through skin, undigested food, feces, and urine. 2  Kidneys can concentrate urine, but only a minimum of 500 ml of water is lost in urine/day and therefore concentration and volume of urine excreted depends on fluid intake.