The Excretory System How Our Body Eliminates Waste

The Excretory System How Our Body Eliminates Waste and keeps us healthy! Excretory System = Urinary System

Function: Removes or excretes excess water, H 2 O, urea, carbon dioxide, CO 2, and other wastes from our blood. Importance: Harmful chemicals made when the body creates energy must be removed from blood to keep you healthy

Body Parts that Excrete Waste Kidneys – filter out excess water, salt and chemicals as urine Lungs – filter out carbon dioxide, CO 2, from the blood. (respiratory system) Skin – excretes water, as sweat, which contains some trace chemical wastes, including urea. (epidermis)

Liquid Waste = Urine Liquid waste = urine

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Artery Kidney Vein Ureter Urinary Bladder Urethra

Order Kidney Ureters Urinary BLADDER Urethra K Ureter B Urethra

Kidneys Function - filter wastes and excess water from the blood. Importance – control the amount of water in body, tell body when to make new red blood cells, take harmful chemicals from blood Other Info – located in back under ribs You have 2 kidneys, but can live with 1 Picture

Ureter Function - tubes that take urine from the kidney to the urinary bladder. Importance – after the waste is filtered from blood, it must go to the bladder for storage Other Info – each kidney has its own ureter Picture

Urinary Bladder Function: a sack that stores urine/liquid waste Importance: Holds urine until you go to the bathroom Other Info: when full, a message is sent to your brain telling you to go to the bathroom Picture

Urethra Function- small tube that carries urine out of the body. Importance – connects the bladder to the outside of the body, how urine leave body Other Info – about 6 mm wide Picture

Nephrons Tiny tubes in the kidneys that filter and clean blood and balance supply of water and salt. (about 1 million per kidney)

Exit 1. The _______ filter waste and excess water from the blood. 2. The tube that carries urine out of the body is called the _______. 3. The urinary bladder stores ______ until it is ready to exit the body.

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Signs of Disease Doctors analyze urine for disease; Normal urine contains water, urea and trace minerals. Sugar in urine indicates Diabetes Protein in urine indicates the kidneys are not working and the person, or animal, is very sick.

1. 2. 3. 4. 5. 6. 7. 8. 9. Excretory System Lungs Skin Kidneys Urine Nephrons Ureter Bladder Urethra

HW review Removes Water = Kidneys, Skin Brings Oxygen to blood = Lungs Removes Salt = Kidneys, Skin Stores Urine = Bladder Removes C 02 = Lungs Produces Urine = Kidneys Removes Body Heat = Skin

Today’s Goal - To memorize the functions and order of the Kidneys, Ureter, Bladder and Urethra - To learn the difference between URETER and URETHRA

Exit 1. What are the tubes that carry urine from the kidneys to the bladder called? 2. The _____ is the tube that carries urine out of the body. 3. What is the job of the kidneys?