Vitamin D

Question 1

Functions

Answer 1

PTH to maintain Ca and P concentrations
They transport from the gut, resorption from bones, re absorption in kidney tubules

Enhances immune function
Form of hormone
Stimulate Co, Be, Fe, Mg, Sr, and Zn

Question 2

Formations

Answer 2

Difficult to obtain sufficient Vit D from diet alone
UV light catalyzes formation from 7-dehydrocholesterol In skin
Index >3
Not adequate in higher latitudes in winter
Vit D3 added to milk

Question 3

Deficiency

Answer 3

Abnormal skeletal development 
   Rickets, osteomalacia, osteoporosis 
Need exposure to sun
Exclusively breast fed 
Vegetarian 
Dark skin pigmentation in northern latitudes 
Full dress or limited outside 
Gastric bypass (fat malabsorption)

Question 4

Toxicity

Answer 4

NOT common
Abnormal ca deposition in soft tissues(kidney, aorta,lungs)
—>kidneys_uremic poisoning
Some plants bypass kidney control (hypercalcemia&hypermagnesium)

Question 5

Absorption

Answer 5

same as vitamin A
Some inhibitory factors are
    Fresh green cereals
    Raw soy protein 
    Destroyed by heat
    Overcome by increased vitamin d 
    Yeast