Excretion Flashcards
Excretion
Is the removal of toxic chemical substances, which are made in the body during metabolism
Excretion
Is one of the characteristics of all living things
Toxic substances
Are poisonous and can harm the cells of the body if not removed
We have 3 excretory organs
- Kidneys
- Lungs
- Skin
Kidneys
- The kidney filter( remove urea and salts) as they clean our blood
- This process is called filtration
Renal artery
Carries blood to kidney
Renal vein
Carries blood from kidney
Kidney
Filters blood to remove urea
Ureter
Transports urine to bladder
Bladder
Stores urine
Urethra
Releases urine
Urea
Which is toxic is produced in the liver from excess protein
Sphincter
.
Lungs
Carbon dioxide and water are waste products of the process of respiration in all the cells of the body
They are
Carried to the lungs by the blood to be excreted
Test for carbon dioxide
Lime water
Test for water
Cobalt chloride paper
Skin
Human skin has sweat glands which leads to pores at the surface- water, salt and a tiny amount of urea is excreted as sweat through these pours