Class #5 - Special Senses And Nervous System

Question 1

What is the blood brain barrier?

Answer 1

• protects the brain
• most impermeable barrier in the body
• found around capillaries in the brain

Question 2

What does the blood brain barrier keep out?

Answer 2

• non-essential amino acids
• potassium ions
• urea
• water soluble toxins
• water soluble wastes

Question 3

What can the blood brain barrier not keep out?

Answer 3

• water
• essential amino acids
• glucose
• fats
• respiratory gases
• fat soluble molecules (toxins & heavy metals)