Parathyroid glands and physiology of bone
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Transcript of Parathyroid glands and physiology of bone
Parathyroid Glands and Physiology of Bone
Calcium in Bones
Actions of 1,25- Dihydroxycholecalciferol
Parts of structure of long bone
Supongy Bone
Bone Resorption-Osteoclastic Activity
Bone Gormation –Osteoblastic Activity
Mineralization
A 36-year-old woman has a parathyroid hormone (PTH)-secreting tumor. Which of the following might be expected to increase as a result of chronic PTH elevation?
◦ Bone resorption *◦ Bone deposition ◦ Ca2+ excretion from the intestines ◦ PO4
3+ absorption from the intestines
◦ PO43+ reabsorption from the kidneys
The normal serum calcium level is ___mg/100 ml?
a) 4-6
b) 6-8
c) 9-11
d) 14-16
Normal daily calcium excretion in urine is ___mg?
a) 50
b) 100
c) 200
d) 300
For calcium metabolism, all of the following are required except?
a) vitamin D
b) parathyroid hormone
c) calcitonin
d) thyroxine
cholecalciferol is?
a) vitamin D3
b) precursor of vitamin D3
c) occurs in skin
d) physiologically active
The active form of vitamin D is?
a) calcium
b) 1,25 DHCC
c) parathyroid hormone
d) cholecalciferol
The primary site of 1,25 DHCC formation from its immediate precursor is?
a) bone
b) liver
c) kidney
d) skin
The following statement about calcium absorption from small intestine are true except?
(A)It occurs by active transport. (B) It requires vit. D and parathormone. (C)It occours by passive diffusion from
upper small intestine. (D)It is decreased by excess phosphate and
oxalate in food