urea

Question 1

urine produced by the kidneys produces a mixture of?

Answer 1

• urea
• excess mineral ions
• excess water

Question 2

large quantities of urine are normally what colour?

Answer 2

• pale yellow
• contains lots of water
• urea is less concentrated

Question 3

smaller quantities of urine are normally what colour?

Answer 3

• darker yellow
• contain less water
• urea is more concentrated

Question 4

why will the concentration of water change?

Answer 4

• water intake
• temperature
• exercise

Question 5

how is urea formed?

Answer 5

• amino acids are filtered into the liver along with the rest of the blood via the hepatic artery and hepatic portal vein
• excess amino acids cannot be stored & need to be broken down so they can be excreted- broken down into carbohydrates and ammonia
• ammonia = toxic - is converted into urea (slightly less toxic chemical)
• amino acids that are needed and the urea are released back into the blood stream via the hepatic vein

Question 6

what are amino acids broken down into?

Answer 6

carbohydrates and ammonia