Excretion

Question 1

We have 3 excretory organs

Answer 1

Kidneys
Lungs
Skin

Question 2

Kidneys

Answer 2

Filter urea and salts from our blood . This process is called filtration. If your kidneys are damaged you may need to go on a dialysis machine .

Question 3

Urea

Answer 3

Which is toxic , is produced in the liver from excess protein

Question 4

Excretion

Answer 4

Excretion is the removal of toxic chemical substances , which are made in the body during metabolism .
Toxic substances are poisonous and can harm the cells of the body if not removed

Question 5

Lungs

Answer 5

Carbon dioxide and water are waste products of the process of respiration in all of the cells of the body. The carbon dioxide and some of the water is carried to the lungs by the blood to be excreted

Question 6

Test for carbon dioxide

Answer 6

Limewater

Question 7

Test for water

Answer 7

Cobalt chloride paper

Question 8

Skin

Answer 8

Human skin has sweat glands which lead to pours at the surface - water , salt and a tiny amount of urea is excreted as sweat through these pores.