EXCRETORY SYSTEM What is the function of the Excretory System? – to remove metabolic wastes from the body What is a Metabolic Waste? –A Waste produced by cells during metabolism What are the Metabolic Wastes? –CO 2, H20, heat, urea, salts nitrogen waste

What organs are involved in Excretion? –Kidneys, lungs, liver, and skin What do the LUNGS excrete? –C0 2, h 2 0, heat are excreted when you exhale What are the functions of the Kidney? –1) filter blood & remove extra water, salt, urea (nitrogen compound), vitamins, minerals, sugar, amino acids –2) maintain water balance in the blood

What is Urine made of? –H20, urea, salt (& other substances) How does the Skin excrete wastes? –Sweat glands remove wastes from the blood & you perspire (perspiration = sweating) What wastes are excreted by the skin? –H 2 0, salts, UREA, - 99% H 2 0

What are the functions of the Liver? –* filters blood and removes nitrogen wastes from extra amino acids and form UREA. –Breaks toxins in blood (drugs and alcohol) –Filters and breaks down your red blood cells

1 kidney-removes waste from the blood -maintains salt & water balance 2 Nephron-microscopic (only 1 cell thick) -blood filtering unit of kidneys 3 Ureter-tube that carries urine from kidneys to bladder 4 Bladder-stores urine 5 Urethra-carries urine from bladder to outside of body

SKIN

1EpidermisDead layer of cells; protects inner layer 2DermisLiving layer of skin cells 3Fat (adipose)Connects layer of skin muscles below it, provides warmth and cushioning 4Oil GlandProduces oil to keep hair & skin moist 5HairProvides warmth & sense of touch 6Nerves/bloodSense of touch- provides nutrients for cells 7Sweat GlandProduces sweat from wastes to help regulate body temperature