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 CONCEPTThe excretory system removes wastes and helps maintain homeostasis.

32.4 Excretory System

• Lungs• exhale carbon dioxide and

water vapor.• Sweat • glands in skin release

excess water and salts.• Kidneys• filter and clean the blood to

produce urine.

skin

lungs

kidneys

ureters

urinary bladderurethra

• Nonsolid wastes are eliminated through lungs, skin, and kidneys.

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