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Systems 2nd Year: Endocrine > Calcium > Flashcards

Calcium Flashcards

1
Q

Functions of Calcium (4)

A

Bone Formation
Cell Division and Growth
Muscle Contraction
Neurotransmitter Release

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2
Q

What happens with Calcium Metabolism between Gut and Extracellular Fluid

A

Secretion from Extracell to Gut

Absorption from Gut to Extracell

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3
Q

What happens with Calcium Metabolism between Extracell Fluid and Bone

A

Deposition from Bone to Extracell

Absorption from Extracell to Bone

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4
Q

What happens with Calcium Metabolism between Kidneys and Extracell Fluid

A

Filtration and Reabsorption

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5
Q

How much Calcium is metabolised in Faeces

A

800mg

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6
Q

How much Calcium is metabolised in Kidneys

A

200mg

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7
Q

How much calcium is found in cells

A

1.0%

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8
Q

How much calcium in extra cell fluid

A

0.1%

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9
Q

How much calcium in bone

A

98.9%

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10
Q

What proportion of Calcium is bound in Plasma

A

40% Bound to Albumin

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11
Q

What proportion of Calcium is non ionised or complexed to citrate

A

15%

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12
Q

What proportion of calcium is ionised or free

A

45%

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13
Q

What is the normal range of plasma calcium

A

2.20-2.60mmol/l

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14
Q

Increased Albumin does what to Free Calcium

A

Decreases

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15
Q

Decreased Albumin does what to Free Calcium

A

Increases

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16
Q

Acidosis does what to Ionised Calcium

A

Increases thus predisposing to Hypercalcaemia

17
Q

What responds directly to changes in calcium concentrations

A

Chief Cells

18
Q

If Ca2+ Increases what happens to PTH

A

Decrease

19
Q

If Ca2+ decreases what happens to PTH

A

Increase

20
Q

Alternations in ECF Ca2+ levels are transmitted into Parathyroid cells via?

A

Calcium Sensoring reCEPTOR

21
Q

PTH is secreted in response to fall in

A

Calcium

22
Q

What mediates conversion of Vit D from inactive to active form

A

PTH

Systems 2nd Year: Endocrine (52 decks)

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