Excretory System 1. Urinary System Diana Abdellatif Objectives • • • • • Identify the functions of the excretory system. List the organs of the excretory system. Outline how the kidneys filter blood. Recognize the mechanism of Urination. Understand the kidney dialysis. Interactive Game • https://www.brainpop.com/games/buildabod yexcretorysystem/ Watch this video Functions • Remove liquid waste from the blood in the form of urine • Keep a stable balance of salts and other substances in the blood • Controls the blood volume by removing excess water produced by the cells. • Produce erythropoietin, a hormone that aids the formation of red blood cells The Kidney Anatomy The Nephron and Urine Formation Now Answer these questions in pairs 1) What is excretion? 2) What is the process that results in wastes being removed from body surface to water in unicellular organisms? 3) What is the chief organ of the excretory system? 4) What organs make up the excretory system? With drawing 5) Kidney is the basic _____________ unit. 6) Draw a kidney including the NEPHRONS. 7) Why are nephrons crucial for kidney function? 8) What does urine contain? How is urine removed from the body? 9) What is the reason we are able to control the urge to urinate? Non-functional Kidney Q: What happens when one kidney doesn’t work properly or stop working? A: The other kidney increases in size and starts to do the function of both of them. Kidney Diseases Q: What happens when both kidneys stop working? A: Waste products that are not removed from the body build up and act as poisons in the body and lead to “Kidney failure” But What would be the solution? Kidney Dialysis • An artificial kidney machine that helps with some of the kidney activities to filter the blood. Kidney Dialysis Kidney Dialysis Parts of the dialysis machine 1. Filter/ Dialyser: act as an artificial kidney, contains a) Fresh dialysing solution >> Solution responsible for absorbing the waste from the blood. b) Semi permeable tubes >> allow the passage of the waste from the blood to the dialysing fluid. 2. Blood Pump: It controls the amount of the blood. 3. Bubble Trap: It traps the bubble that presents in the cleared blood from entering the body. 4. Blood thinner: It is a heparin pump to prevent the blood clotting.