Iron

Question 1

What are the 2 forms of iron

Answer 1

heme iron & non heme iron

Question 2

Define heme iron

Answer 2

in hemoglobin/myoglobin; more bioavailable

Question 3

What state is heme iron

Answer 3

ferrous (Fe +2)

Question 4

Define non-heme iron

Answer 4

form found in proteins for iron storage and transportation

Question 5

What state is non-heme iron

Answer 5

Ferric (Fe+3)

Question 6

Hemoglobin accounts for __% of body Fe

Answer 6

65%

Question 7

Describe ferritin

Answer 7

primary storage form of Fe in cells

Question 8

How is iron absorption regulated to prevent toxicity

Answer 8

ferritin in all SI cells

Question 9

What is hemosiderin

Answer 9

secondary iron storage protein; utilized during Fe overload

Question 10

What is transferrin

Answer 10

Fe transfer protein; receptors in all cells

Question 11

What are heme enzymes

Answer 11

cytochromes; used in the ETC

Question 12

Where is iron primarily absorbed

Answer 12

duodenal

Question 13

Iron absorption rate

Answer 13

10-15% for mixed diets

Question 14

heme iron must be ____ from the globin before absorption

Answer 14

hydrolyzed

Question 15

bioavailability of heme iron

Answer 15

15-35%

Question 16

What dietary factors enhance absorption of nonheme iron

Answer 16

Vitamin C, organic acids, MFP factor

Question 17

Why does vitamin C enhance absorption of nonheme iron

Answer 17

converts ferric to ferrous, which is absorbed more efficiently