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Chapter 30.4: Excretory System

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Presentation on theme: "Chapter 30.4: Excretory System"— Presentation transcript:

1 Chapter 30.4: Excretory System

2 Role of the Excretory System
Removes waste from the body Excretion is the process by which metabolic wastes are eliminated to maintain homeostasis

3 Structures of the Excretory System
Skin Excretes water and salts Lungs Excrete carbon dioxide Liver Converts nitrogen waste into urea

4 Structures of the Excretory System
Kidneys Filter excess water, urea and metabolic waste from blood Ureters Transport urine from kidneys to bladder Urinary bladder Stores urine Urethra Releases urine outside the body

5

6 Homeostasis and the Kidneys
When waste builds up in the blood, it increases filtration by the kidneys The pituitary gland releases antidiuretic hormone (ADH) if blood fluid levels are low, causing the kidneys to reabsorb more water into the blood

7 Kidney Disorders Kidney stones Kidney damage Kidney failure
Calcium, magnesium, and other salts can crystallize in the kidney Kidney damage High blood pressure can harm the filtering mechanism of the kidney Kidney failure Occurs when kidneys can no longer filter the blood, and will lead to death if untreated

8 Kidney Disorder Treatment
Dialysis Uses a machine to filter wastes from the blood Kidney Transplant Leaves damaged kidneys in place unless they are secreting toxins Adds donor kidney and ureter below old kidney A human can function with only one kidney


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