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.
Urine is produced when your kidneys filter waste and extra water out of your blood. The waste travels to your bladder, which holds the urine until youâre ready to use the bathroom. Then the bladder muscles contract, sending urine out through a tube called the urethra. This process is important.