Chapter 15 - Trace Minerals Flashcards
(66 cards)
What is the definition of trace mineral?
essential but you don’t need that much of it
What are the functions of iron?
-essential for delivery of oxygen to cells
Where is most iron located?
in hemoglobin
What is hemoglobin?
quaternary structured protein
Iron is also found in myoglobin, which is found where?
muscle tissue
What is the last thing iron functions as?
coenzyme
What are good sources of iron?
Life cereal animal products dark greens dried fruit (b/c of serving sz) fortified foods
What types of foods have the highest iron bioavailability?
meats
fish
poultry
What types of beans offer the most iron?
darker pigmented beans
What is the major iron storage protein?
ferritin
What is the major iron transport protein in the blood?
transferrin
Where is extra iron shed?
in intestinal cells
Where is iron stored?
bone marrow
spleen
liver
What percentage of iron is absorbed?
14-18%
What affects the amount of iron absorbed?
iron status dietary consumption type and amount ingested dietary factors stomach acid
What are the two types of iron?
heme and non-heme
Where is heme iron found?
animal foods
Heme iron makes up how much of the DI?
10%
What is the absorption rate of heme iron?
25%
Non-heme iron is found where?
animal and non-animal foods
Non-heme iron DI?
90%
Non-heme iron absorption rate?
17%
What enhances iron absorption?
- high iron demand/low body stores
- MFP
- Vitamin C
- Acids
How does high iron demand/low body stores enhance iron absorption?
if you’re deficient, you will have a higher absorption rate
