Download 32.4 Excretory System

32.4 Excretory System
Sponge # 10
1. What happens if the indigestible material
in the large intestines moves through it too
quickly? Too slowly?
2. When oxygen-poor blood travels to the
lungs, what is the waste product it is
dropping off? What is it picking up?
3. What part of the mouth uses mechanical
digestion? Chemical?
4. Where does digestion start?
32.4 Excretory System
1. What happens if the indigestible material in the large
intestines moves through it too quickly? Too slowly?
• Diarrhea
• Constipation
2. When oxygen-poor blood travels to the lungs, what is the
waste product it is dropping off? What is it picking up?
• Carbon Dioxide (CO2) and water vapor
• Oxygen
3. What part of the mouth uses mechanical digestion?
Chemical?
• Teeth
• Saliva
4. Where does digestion start?
• Mouth
32.4 Excretory System
• List any non-solid wastes in your
body that comes to your mind.
32.4 Excretory System
KEY CONCEPT
The excretory system removes wastes and helps
maintain homeostasis.
32.4 Excretory System
• Nonsolid wastes are eliminated through lungs, skin, and
kidneys.
• Lungs
• exhale carbon dioxide and
water vapor.
• Skin
• Sweat glands in skin
release excess water and
salts.
• Kidneys
• filter and clean the blood to
produce urine.
skin
lungs
kidneys
ureters
urethra
urinary bladder
32.4 Excretory System
• The Bladder stores urine
• Ammonia is the toxic product produced when the
body breaks down amino acids for energy
– It is removed from the body by the kidneys
32.4 Excretory System
• Kidneys have three basic functions in maintaining
homeostasis.
– remove waste from blood
– help to maintain electrolyte, pH, and fluid balances
– release key hormones