Riboflavin revision questions - week 10

Question 1

Food source

Answer 1

milk, mushrooms, egg, liver, enriched grain

Question 2

Absorption

Answer 2

• HCL in stomach releases riboflavin bound to dietary compounds
• free riboflavin absorbed via active transport or passive diffusion depending on concentration (60-65%) absorbed

Question 3

Transport

Answer 3

• protein carriers in blood

- converted to coenzyme form: flavin mononucleotide (FMN) or flavin adenine dinucleotide (FAD), in most tissue

Question 4

Storage

Answer 4

small amounts in liver, kidneys and heart

Question 5

Excretion

Answer 5

• urine (will cause bright yellow urine when riboflavin taken as supplement)

Question 6

Activation

Answer 6

Flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) are active forms

Question 7

Main function

Answer 7

Coenzyme in numerous oxidation-reducing reactions - including those of energy release

Question 8

RDI

Answer 8

men - 1.3mg

women - 1.1mg

Question 9

UL and toxicity

Answer 9

none

Question 10

Deficiency

Answer 10

ariboflavinosic - inflammation of mouth and tongue, cracks in corner of mouth