Calcium homeostasis

Question 1

Plasma calcium concentration is maintained within narrow limits, what are they

Answer 1

2.2-2.6 mmol/L

Question 2

What are the mos important hormones in calcium homeostasis

Answer 2

PTH (Parathyroid hormone), calcitriol and calcitonin

Question 3

what hormone is increased in response to low serum ionised calcium

Answer 3

-PTH
-1) decreasing renal calcium excretion 2) increasing bone resorption and 3) enhancing dietary calcium absorption by stimulating the production of calcitriol in the kidney

Question 4

Where is calcitonin released from

Answer 4

C cells in thyroid

Question 5

What hormone is increased in response to high calcium serum

Answer 5

Calcitonin
-supresses ostoclasts
-increases calcium excretion in urine

Question 6

approx how much of dietary calcium do we absorb

Answer 6

30%

Question 7

what is the active form of vitamin D

Answer 7

Calcitriol

Question 8

what cells in the bones release calcium

Answer 8

ostroclast

Question 9

The amount of calcium filtered by the glomerulus depends on:
:

Answer 9

-The glomerular filtration rate
-The ultra filtrable calcium
-Ionised
-Complexed

Question 10

is sodium is high

a) more calcium is resorbed
b) less calcium resorbed

Answer 10

b

Question 11

what is avg grams of calcium in body

Answer 11

1200

Question 12

how many grams of acacia in extracellular space

Answer 12

1

Question 13

what is extracelllualr calcium used for

Answer 13

normal blood clotting

muscles contraction

nerve fucntion