AP BIOLOGY

Detailed explanation-1: -Kidneys help in the elimination of wastes from the body in the form of urine. Kidneys are the main organs of excretion in humans. Apart from kidneys, other organs like lungs, liver, skin and sebaceous glands also help in excretion.

Detailed explanation-2: -Organs of excretion include the skin, liver, large intestine, lungs, and kidneys. All of them excrete wastes, and together they make up the excretory system . The skin plays a role in excretion through the production of sweat by sweat glands.

Detailed explanation-3: -The skin also acts as an excretory organ. It is estimated that 3 to 4 million eccrine sweat glands which together roughly weigh the same as one kidney (i.e., 100 g) are distributed over almost the entire human body surface.

Detailed explanation-4: -Humans excrete salts through kidneys and skin. Sweat glands are used to regulate temperature and remove waste by secreting water, sodium salts, and nitrogenous waste (such as urea) onto the skin surface.

Detailed explanation-5: -The main excretory organs include kidney, ureter, urinary bladder and urethra. Kidneys filter the blood and urine is the filtrate obtained. Urine passes to the urinary bladder via ureter and is expelled out of the body.