C12 Excretion

Question 1

What is excretion

Answer 1

The removal of waste products made by the body

Question 2

What is egestion

Answer 2

• The removal of waste products not made by the body

Question 3

What is secretion

Answer 3

The release of useful substances from cells

Question 4

How does the mammalian body excrete several compounds?

Answer 4

• The mamalian body excretes several compounds, using four excretory organs i.e. The skin, Liver, Kidneys and Lungs

Question 5

What waste products are excreted via the lungs

Answer 5

• CO² and H20 are…
• Created during the metabolic process of respiration
• & expelled in expired air
• Via the lungs

Question 6

What waste products are removed via the kidneys

Answer 6

Urea, Creatinine & Uric acid are…

Created during the metabolic processes of Amino Acid breakdown, Muscle tissue breakdown, Nucleic acid breakdown respectfully.

They are then excreted via the Kidneys in Urine

Question 7

What waste product is excreted via the Skin

Answer 7

• Urea is created during sweating
• It is released via the skin as sweat

Question 8

What waste products are excreted via the liver

Answer 8

• Bile pigments are formed
• when haemoglobin is broken down
• in the liver
• and excreted in the faeces

Question 9

Why is water not only a waste product

Answer 9

Water can be excreted from the body via the lungs as a metabolic waste product of respirations

Water can be secreted in tears and saliva

Water can be egested in the faeces