What is excretion?
The removal of waste products of metabolism, toxic materials, and excessive useful substances.
What is the difference between excretion and egestion?
Egestion is removal of undigested/unabrorbed food
Excretion is the removal of body’s metabolic waste
What are the 3 organs in the excretory system?
Lungs, to excrete carbon dioxide
Liver, process toxic materials so they become harmless. Product is toxic materials like drugs
Kidney, to excrete urea (& salt)
What are excretory products made from body metabolism?
Carbon dioxide is the waste from the body’s respiration and is transported to the lungs by the blood plasma which will excrete it by the process called exhale
Urea is a waste from the liver’s action of breaking down excess amino acids (converted from ammonia to urea) and will be delivered to the kidney by blood. The urea is obtained by the kidney by filtering the blood in its structures called nephrons
