Vitamin D

Question 1

The chemical structure of vitamin D was determined in 1930 by:

a. Professor Windaus
b. Professor Eisenhoff
c. Professor Weinstein
d. Professor Reinheart

Answer 1

a

Question 2

Where is vitamin D stored?

a. Liver
b. Tissues
c. Muscle
d. Fat

Answer 2

d

Question 3

why is Megalin important in the maintenance of renal vitamin D metabolite homeostasis?

Answer 3

Reabsorbs vitamin D from glomerular filtrate

Question 4

what binds to vitamin D and transports it to cells via the bloostream?

Answer 4

vitamin D binding protein

Question 5

what organ activates vitamin D?

a. Pancreas
b. Small intestine
c. Liver
d. Kidney

Answer 5

c

Question 6

which vitamin D form interacts with the vitamin D receptor?

a. 25-OH Cholecalciferol
b. 1a,25-OH Cholecalciferol
c. 1 a,24,25-OH Cholecalciferol
d. Cholecalciferol

Answer 6

b

Question 7

how is vitamin D eliminated from the body?

a. as it is
b. as an alcohol
c. as an ester
d. as a carboxylic acid

Answer 7

d

Question 8

what is the most important effect of hypervitaminosis D?

a. CNS damage
b. Hypercalcemia
c. Diabetes
d. Hepatitis

Answer 8

b

Question 9

T/F vitamin D controls absorption of calcium

Answer 9

True

Question 10

The liver converts vitamin D3 into:

a. 24,25(OH)2D3
b. 1a,25-OH Cholecalciferol
c. 25 OHD3
d. 1,25(OH)2D3

Answer 10

c

Question 11

The kidney converts 25 OHD3 into:

a. 1,25(OH)2D3
b. 1 a,24,25-OH Cholecalciferol
c. 24,25(OH)2D3
d. b and c
e. all of the above

Answer 11

d

Question 12

calcium malabsorption is least likely to result in:

a. increase release of PHT
b. increase RANKL signaling
c. increase production of 1a,25OH Cholecalciferol
d. decreased osteopontin production

Answer 12

d

Question 13

what does vitamin D act upon to regulate insulin levels and blood pressure?

a. Angtiotensin I and II
b. Angiotensinogen
c. Renin
d. stimulation of the pancreas to release glucagon

Answer 13

c

Question 14

why is age a risk factor for vitamin D?

Answer 14

the older you get the less calcium your body has which effects vitamin Ds ability to absorb it

Question 15

which of these statements is false?

a. vitamin D supplement increases serum cholesterol in men
b. vitamin D supplement decreases serum cholesterol in women
c. vitamin D supplement had no effect on serum cholesterol in women compared to placebo
d. vitamin D supplement effect varies between men and women

Answer 15

c

Question 16

which of these statements is false?

a. vitamin D supplement had no effect on serum LDL in men compared to placebo
b. vitamin D supplement decreases serum LDL in woman
c. vitamin D supplement increases serum LDL in med
d. vitamin D supplement effect varies between men and women

Answer 16

a

Question 17

which of these statements is false?

a. vitamin D supplement decreases serum hs-CRP in men
b. vitamin D supplement had no effect on serum hs-CRP in men
c. vitamin D supplement decreases serum hs-CRP in women
d. placebo given to both men and women showed increases in serum hs-CRP

Answer 17

b

Question 18

what bone condition can result from vitamin D deficiency?

a. osteoarthritis
b. osteoporosis
c. rickets
d. avascular necrosis

Answer 18

c