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Set 9 8 Calcium And Phosphorus Homeostasis Ii

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Question 1

(Multiple Choice)

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PTH

A) Increases calcium reabsorption but not phosphate reabsorption in the distal tubule
B) Increases both calcium and phosphate reabsorption in the distal tubule
C) Increases both calcium and phosphate reabsorption in the proxim al tubule
D) Inhibits both calcium and phosphate reabsorption in the distal tubule
E) Increases calcium reabsorption and inhibits phosphate reabsorption in both proximal and
distal tubule

Answer

Question 2

(Multiple Choice)

Free
The most likely function of calbindin is

A) Increase calcium diffusion across the enterocyte’s cytosol
B) Activate ECaC
C) Buffer [Ca] so that it does not harm the enterocyte
D) Activate PMCA
E) Both A and C are true

Answer

Question 3

(Multiple Choice)

Free
Osteoblasts do all of the following EXCEPT

A) Form the osteoid, or organic matrix of bone
B) Recruit osteoclasts from stem cells in the blood
C) Secrete M-CSF (macrophage colony stimulating factor) in response to PTH
D) Secrete osteoprotegrerin to block preosteoclast binding
E) Form resorption canals

Answer