Lecture 13

Question 0

Cholecalciferol is formed

Answer 0

in the skin

Question 1

vitamin D as a hormone

Answer 1

it is a fat soluble hormone that is responsible for the absorption of calcium and phosphate in the intestinal tract

Question 2

vitamin D is converted to

Answer 2

25 vitamin D

Question 3

the final active form of vitamin D is

Answer 3

1, 25 Vitamin D, which circulates the blood

Question 4

the formation of 1,25 vitamin D occurs in the

Answer 4

kidneys

Question 5

role of PTH

Answer 5

increases the activity of the enzyme that converts 25- vitamin D to 1,25 vitamin D

Question 6

PTH is stimulated by

Answer 6

the chief cell of the parathyroid

Question 7

role of PTH in the bone

Answer 7

act to increase ca++ in the blood

it enhance the release of c++ in large reservoir in the bone

Question 8

role of PTH in the kidneys

Answer 8

enhance the active reabsorption of calcium and magnesium

it also decrease the absorption of phosphate

Question 9

role of PTH in the GI tract

Answer 9

allows for the up take of c++ by increasing the activation of vitamin D

Question 10

thyrocalcitonin

Answer 10

it is a hormone produced by the parafollicular cells of the thyroid gland

Question 11

role of thyrocalcitonin

Answer 11

it acts to reduce blood ca++ opposing to PTH

Question 12

thyrocalcitonin role in the intestine

Answer 12

inhibit the absorption of ca++

Question 13

thyrocalcitonin role in the bone

Answer 13

inhibit osteoclast activity

Question 14

thyrocalcitonin

Answer 14

inhibit renal tubular cells reabsorption of ca++

Question 15

pineal gland

Answer 15

small endocrine gland in the brain

Question 16

the pineal gland is innervated by

Answer 16

the parasympathetic and the sympathetic nervous system

Question 17

the pineal gland is outside

Answer 17

the blood brain barrier