AP BIOLOGY

Detailed explanation-1: -The primary role of eccrine sweat is thermoregulation through the release of latent heat from the evaporation of water. Additional functions of eccrine glands include excretion of water and electrolytes, and acidification of the skin, which prevents the colonization and growth of microorganisms.

Detailed explanation-2: -The kidneys Materials eliminated via the kidney include nitrogenous waste products (ammonia, uric acid, urea, creatine, creatinine, and amino acids), excess quantities of salts and water that may be taken into the body, and various other organic materials produced by life-sustaining chemical reactions.

Detailed explanation-3: -Kidneys. The paired kidneys are often considered the main organs of excretion. The primary function of the kidneys is the elimination of excess water and wastes from the bloodstream by the production of the liquid waste known as urine .

Detailed explanation-4: -Role of the skin: Skin has has two types of glands which help in excretion of waste products – sweat and sebaceous glands. (i) Sweat glands are highly vascular and tubular glands that excrete excess salt and water from the body in the form of sweat. Sweat helps in thermoregulation.

Detailed explanation-5: -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.