Nitrogen Metabolism

Question 1

Where do amino acids come from?

Answer 1

Ingested protein

Body proteins

Question 2

What’s the difference between essential and non-essential amino acids?

Answer 2

Both equally important
Can make non-essential amino acids
Cannot make essential amino acids
Essential amino acids need to come from diet

Question 3

What determines an individual’s nitrogen balance status?

Answer 3

Dietary nitrogen intake (cellular material and dairy) 
Physiological state (which influences nitrogen retention and exretion)

Question 4

Name the nitrogen balance statuses.

Answer 4

In balance
Positive
Negative

Question 5

What happens in the balanced nitrogen state?

Answer 5

Nitrogen intake (dietary amino acids, nucleotides) = nitrogen excretion (urine, faeces, hair and skin loss, perspiration)

Question 6

What is the positive nitrogen state associated with?

Answer 6

Increase in lean mass

Question 7

What happens in the positive nitrogen state?

Answer 7

Nitrogen intake > nitrogen excretion

Question 8

What causes a positive nitrogen state?

Answer 8

Childhood and adolescent growth
Pregnancy
Body building