EXCRETORY SYSTEM What is the function of the

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, H 20, heat, urea, salts nitrogen waste

• What organs are involved in Excretion? – Kidneys, lungs, liver, and skin • What do the LUNGS excrete? – C 02, h 20, 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? – H 20, 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 20, salts, UREA, - 99% H 20

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

SKIN

1 Epidermis 2 Dermis 3 Fat (adipose) 4 Oil Gland 5 Hair 6 Nerves/blood 7 Sweat Gland Dead layer of cells; protects inner layer Living layer of skin cells Connects layer of skin muscles below it, provides warmth and cushioning Produces oil to keep hair & skin moist Provides warmth & sense of touch Sense of touch- provides nutrients for cells Produces sweat from wastes to help