Vitamin D

Question 1

What two hormones (?) regulate serum calcium concentration

Answer 1

PTH

Vitamin D

Question 2

Which three body systems are most involved with calcium metabolism

Answer 2

Kidneys
Bones
Gastrointestinal Tract

Question 3

What effect does PTH have on serum calcium concentration

Answer 3

PTH increases serum calcium concentration

Question 4

What effect does PTH have on the kidneys

Answer 4

Increases Calcium reabsorption, activation of Vitamin D

Question 5

What effect does PTH have on bones

Answer 5

Increases Calcium release from bones

Question 6

What effect does activated Vitamin D have on the GI tract

Answer 6

Increases Intestinal Calcium absorption

Question 7

What is the most active form of Vitamin D

Answer 7

1,25-dihydroxyvitamin D

Question 8

What is normal plasma calcium

Answer 8

2.2-2.6mmol/L

Question 9

What proportion of plasma calcium is ordinarily ionised and physiologically active

Answer 9

40%

Question 10

How is 60% of plasma calcium found

Answer 10

Bound to albumin, unavailable to tissues

Question 11

What is corrected Calcium adjusted for

Answer 11

Albumin concentration

Question 12

What effect does activated Vitamin D have on bone

Answer 12

Increases