Chapter 6- Minerals (Oct 13 Lec)

Question 1

Most iron in the body is present where?

Answer 1

red blood cells

Question 2

Functions of iron:

1. Heme proteins
2. Non-heme proteins

Answer 2

1. Heme proteins: heme group attaches to various proteins
   - O2 transport (eg hemoglobin)
   - e- transport in mitochondria
   - liberates O2 from peroxides
2. Non-heme proteins:
   - enzymes

Question 3

Iron comes from food in 2 forms:

Answer 3

1. Heme= found in animal flesh (meat, poultry, seafood)

2. Non-heme: plant foods like whole grains, nuts, seeds

Question 4

why is iron supplemented to suckling pigs raised in confinement?

Answer 4

they’re at risk of anemia b/c they don’t get iron from the dirt etc if they were outside

Question 5

list 5 functions of manganese (Mn)

Answer 5

1. bone structure
2. activator of many enzymes
3. metalloenzymes
4. brain function (acetylcholine deactivation)
5. enzymes (CHO, lipid, protein metabolism)

Question 6

Which micromineral has a very small range between minimum requirement and toxic amount?

Answer 6

selenium (Se)

Question 7

factors affecting mineral absorption

Answer 7

• phytate
• fibre
• oxalic acid
• mineral interactions
• chelation

Question 8

Why does phytate have reduced bioavailability?

Answer 8

it forms complexes with metals or proteins which reduces bioavailability in the digestive tract ``