vitamins

Question 1

B12

1. stored where?
2. reserve sufficient for how long?

Answer 1

1. liver

2. several years

Question 2

Vit A

1. stored where?
2. lasts how long

Answer 2

1. perisinusoidal stellate (Ito) cells of liver

2. 6 months

Question 3

Vit D

1. stored where
2. lasts how long

Answer 3

1. adipose

2. w/out sunlight -> several months

Question 4

Folate

1. stored where
2. lasts how long

Answer 4

1. half in liver

2. 3-4 months

Question 5

Vitamin K

1. where stored/formed
2. lasts how long

Answer 5

1. liver (small quantity), made by bacteria in large intestine
2. 1-3 weeks

Question 6

Niacin B3

• essential component of what coenzyme
• obtained from where
• what is its precursor

Answer 6

• NAD (nicotinamide adenine dinucleotide) and NADP
• dietary (grains, legumes, seed oils, fruits, veggies, meats)
• tryptophan