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.
If euhydrated people consume excess fluid, renal water reabsorption decreases, and the excretion of solute-free water increases. When fluid intake is just sufficient to maintain body water content, the protracted period of time between fluid intakes requires that the body save water by concentrating urine.