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Systems Physiology > Calcium Homeostasis > Flashcards

Calcium Homeostasis Flashcards

1
Q

What is normal blood calcium?

A

9-11 mg/100ml

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2
Q

Hypocalcemia causes what in parathyroid gland?

A

Chief cells of parathyroid gland to release PTH

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3
Q

How does bone raise blood calcium?

A

By increasing osteoclasts.

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4
Q

How does kidney raise blood calcium?

A

By increasing calcium absorption and decreasing phosphate absorption (increases phosphate in urine by phosphate buffer system)

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5
Q

What does hypercalcemia cause in thyroid gland?

A

Causes parafollicular cells of thyroid to release calcitonin.

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6
Q

How does bone lower blood calcium?

A

By increasing osteoblasts.

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7
Q

How does kidney lower blood calcium?

A

By decreasing calcium absorption and increasing phosphate absorption.

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8
Q

What hormone is released in response to hypocalcemia?

A

Parathyroid hormone

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9
Q

Where is parathyroid hormone released from?

A

Chief cells of parathyroid gland

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10
Q

How does kidney cortex raise blood calcium?

A

By formation of Vitamin D3/Calcitrol

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11
Q

What happens as a result of decreased phosphate absorption?

A

Phosaphte increases in the urine.

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12
Q

What can an excessive amount of phosphoric acid lead to?

A

Osteoporosis

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13
Q

What does calcitrol/vitamin D3 do?

A

Increases calcium and phosphorus absorption from the intestines.

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14
Q

What do you need to absorb calcium?

A

Vitamin D

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15
Q

What hormone is released in response to hypercalcemia?

A

Calcitonin

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16
Q

Where is calcitonin released from?

A

Parafollicular cells of thyroid gland

17
Q

How does bone lower blood calcium?

A

By increasing osteoblasts

18
Q

How does kidney lower blood calcium?

A

By decreasing calcium absorption and increasing phosphate absorption

Systems Physiology (11 decks)

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