The Excretory SystemHB&H Chapter 5.3

Pages 145-150

What a Waste• Your cells use up nutrients from food (protein,

carbs, vitamins) and create waste• The Excretory System collects and removes

waste from the body– Like trash collectors

• Process of removing waste is called Excretion.

Your Wha?• To leave the body, urine

follows this path…1. Kidneys2. Ureters – tubes leading

out of the kidneys3. Urinary Bladder –

pouch that stores urine4. Urethra – tube that

leads out of the body

• Urea and other waste is removed from the body in the form of Urine: mixture of water and urea.

Organs of Importance

• The major organs of the Excretory System are your two Kidneys

• Kidneys filter out waste called Urea, a chemical made from broken down proteins.

Filtration Station• Your kidneys filter 180

liters of fluid each day– Only about 2 liters are

converted into Urine• The kidney contains

hundreds of thousands of filters called Nephrons: structures that remove waste from blood.

Water Weight

• Up to 60% of your body is water

• You need to take in 2 liters of water a day

• Kidneys help maintain water levels to keep you in Homeostasis (stable internal environment).

Ur-ine Trouble!• Urine can be tested to check

for illness– Glucose (a simple carb) in the

urine indicates risk of Diabetes– Protein in urine can indicate

problems with your kidneys• Urine is also a good indicator

of your hydration levels.

Exit PassWhat are 2 of the 4 parts of

the Excretory System?

What to Work On

• Read Section 5.3 in your textbook (pages 145-150)

• Answer the section review questions (#’s 1-4) on page 150

DUE: Friday, April 27th