Topic 5.1: Communication and homeostasis

Question 1

What is excretion ?

Answer 1

• Removal of metabolic waste products that are toxic are allowed to build up.

Question 2

What are the waste products ?

Answer 2

• Carbon dioxide
• Urea
• Bile

Question 3

What are the three main functions ?

Answer 3

• Storage of glyocgen
• Detoxification
• Formation of urea

Question 4

Explain the storage of glycogen

Answer 4

• The liver responds to the hormones insulin and glycogen to control glucose levels in the blood.
• The liver converts glycogen into glucose in a process called glucogenesis.
• The glycogen is stored in the liver until the glucose is needed for energy

Question 5

Explain detoxification

Answer 5

• hydrogen peroxide broken down by catalase into oxygen and water, it is an intracellular - works within hepacytes.
• Catalse is a globular protein (circular/insoluble/ has hydrophillic and hydrophobc regions)
• Alcohol-broken by alcohol dehydorgenase into ethanol than ethnoate used for repiration for bulit up fatty acids.