Excretion

Question 1

Homeostasis

Answer 1

Keeping a body a constant environment around the cells of the body

Question 2

Different Waste products and why they have to be excreted

Answer 2

• Carbon Dioxide, produced during respiration, dissolves in the plasma and tissue fluid to form a weak acid that can denature enzymes
• Urea - produced in liver and can also denature enzymes
• Salts - Can be in excess diet can have an effect of water potential in the blood

Question 3

Excretion

Answer 3

Removal of toxic materials, the waste products of metalbolism and substances in excess reqirements

Question 4

Role of the kidney

Answer 4

• Remove toxic waste product urea from the circulating blood - the carry out excretion
• Regulate the water content of blood - carry out osmo-regulation

Question 5

Adaptations of the structures of the kidney

Answer 5

• Recieves a good flow of flood from the renal artery at high pressures
• Each kidney contain 100s of tubes called nephrons , that can filter substances through the blood
• Each kidney has a exit tube the ureter carry out the urine
• Close to the feedback system water saving is balenced