Excretion

Question 0

Toxic substances

Answer 0

Are poisonous and can harm the cells of the body if not removed.

Question 1

Excretion

Answer 1

Is one of the characteristics of all living things. Excretion is the removal of toxic chemical substances, which are made in the body during metabolism.

Question 2

3 Excretory organs

Answer 2

Kidneys, lungs and skin.

Question 3

The kidneys:

Answer 3

Filter (remove urea and salts) as they clean our blood. This process is called filteration.

Question 4

Renal artery

Answer 4

Carries blood to the kidney.

Question 5

Renal vein.

Answer 5

Carries blood from kidney.

Question 6

Ureter

Answer 6

Transports urine to bladder.

Question 7

Bladder

Answer 7

Stores urine.

Question 8

Urethra

Answer 8

Releases urine.

Question 9

Urea

Answer 9

Which is toxic and is produced in the liver from excess protein.

Question 10

Lungs

Answer 10

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.

Question 11

Test for Carbon dioxide:

Answer 11

Limewater.

Question 12

Test for water:

Answer 12

Cobalt Chloride paper.

Question 13

Skin

Answer 13

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