EXCRETORY SYSTEM

1
EXCRETORY SYSTEM

• Chapter 48 section 3
• PP 993-998

2
Excretory System

• Every cell in the body produces metabolic waste.
• Skin, lungs, and kidneys make up this system.

3
Function

• SKIN

• LUNGS

• Excretes water, salts, small amounts of
  nitrogenous wastes

• Excretes water vapor and CO2

4
Function Urinary System

• Formation and excretion of urine
• Urine is mostly water, keeps wastes dissolved and
  easier to excrete
• Involves Kidneys and Bladder

5
Steps Filtration

• Blood forced into kidneys
• Urea, wastes, and various substances are removed

6
Steps ReAbsorption

• Some substances are return to blood maintain
  balance
• Ex. Salts

7
Steps Elimination

• Waste (urine) is stored in bladder until it is
  secreted through the urethra

8
Urine

• Waste removed from the blood by the kidneys
• Contains urea, water, salt
• Very light yellow color

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What Urine Tells Us

• Kidney Damage - Proteins may leak into the urine
• Dark Yellow color - dehydration
• Brown color - bleeding from the kidneys
• High Glucose - the individual is diabetic
• Low or no glucose - hypoglycemia, which results
  from too much insulin