AP BIOLOGY

Detailed explanation-1: -The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism. The kidney, the lungs, and the skin form the excretory system. They throw out the harmful or waste substances which the body does not need.

Detailed explanation-2: -The urinary system’s function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters, bladder and urethra.

Detailed explanation-3: -Kidney: Filters impurities out of blood. Removes excess water from the body. Ureter: Tubes that carry urine from the kidneys to the bladder. Bladder: The organ that holds the urine until it builds up and is released.

Detailed explanation-4: -Human excretory system has four parts namely kidneys, ureters, urinary bladder and urethra.

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.